Quiz 7-1 pythagorean theorem special right triangles & geometric mean

Mar 27, 2022 · Figure 1.8.2. Confirm with Pythagorean Theorem: x2 +x2 2x2 = (x 2–√)2 = 2x2. Note that the order of the side ratios x, x 3–√, 2x and x, x, x 2–√ is important because each side ratio has a corresponding angle. In all triangles, the smallest sides correspond to smallest angles and largest sides always correspond to the largest angles ...

Module 7: Right Triangles Topic 1 Content: The Pythagorean Theorem Transcript . 2. Let's start using that Pythagorean Theorem to solve this triangle. C. 2 = 2A. 2 + B. Like I said, you're going to often see me write it this way, which is fine. C I know is x. x. 2 = 5. 2 + 8. 2. Let's start to simplify this equation. x. 2 = 5 is 25, and 8. 2. is 64.In mathematics, the Pythagorean theorem or Pythagoras' theorem is a fundamental relation in Euclidean geometry between the three sides of a right triangle.It states that the area of the square whose side is the hypotenuse (the side opposite the right angle) is equal to the sum of the areas of the squares on the other two sides.. The theorem can be …Geometry: The Pythagorean Theorem. 1. The two triangles formed are similar to the given right triangle and to each other. 2. The altitude to the hypotenuse is the mean proportional between the segments of the hypotenuse (x/h=h/y, or h²=xy) 3. Either leg of the given right triangle is the mean proportional between the hypotenuse of the given ... Quiz 8-1: Pythagorean Theorem/Special Triangles/Trig Ratios quiz for 9th grade students. Find other quizzes for Mathematics and more on Quizizz for free! The catch! c must be greater than either a or b, but less than a + b. 2. Construct these triangles; you may use Patty Paper or simply draw them on scrap / white paper. 3. Make a conjecture about the type of triangle that results for …1. If 6 square is the geometric mean between 4 and another number, then the number is. 1.5. Theorem 5-9. If the altitude to the hypotenuse of a triangle is drawn, the two triangles are similar to each other and similar to the given triangle. Study with Quizlet and memorize flashcards containing terms like Altitude of a triangle, Geometric mean ...Pythagorean Theorem quiz for 8th grade students. Find other quizzes for Mathematics and more on Quizizz for free! ... Will this make a right triangle. yes. no. maybe. 22. 3. Multiple Choice. Edit. 2 minutes. 1 pt. Do the segment lengths 9, 11 and 15 cm form a right triangle? yes. no. maybe. pythagoras. 4. Multiple Choice. Edit. 2 minutes. 1 pt.Apr 14, 2013 ... ... Theorem. 922 views ... Geometry - Unit 6 Lesson 2 Special Right Triangles ... Geology 110 Mineral and Rock Identification Pre Test answers Spring ...

trigonometry. the study of the relationship between side lengths and angles in triangles. opposite leg. the leg across from a given acute angle in a right triangle. adjacent leg. the leg that touches a given acute angle in a right triangle. theta. the symbol θ used as a variable for an angle. sine/sin.a right triangle that consists of a right angle, a 30 degree angle, and a 60 degree angle. 30-60-90 Triangle Theorem. In a 30°-60°-90° triangle, the hypotenuse is twice as long as the shorter leg, and the longest leg is √3 times as long as the shorter leg. opposite side in a right triangle. The side across from an angle.The Pythagorean Theorem Simplify. Find the geometric mean between the two numbers. DATE SCORE For use after Section 8—2 9. 3 and 64 7. 6 and 24 8. 3 and 12 Each diagram shows a right triangle with the altitude drawn to the hypotenuse. Find the values Of x, y, and z. Find the value Of x. 18. A rectangle has length 2.4 m and width 0.7 m. Find ...Let's have a look at geometric mean triangles and proof of this theorem. We'll show that in two ways – using the similarity of the triangles and the Pythagorean theorem. Following the image description, h is the altitude of a right triangle from its right angle, which splits the hypotenuse into two segments: p p p and q q q. 1. Triangles ...Quiz: Practice Geometric mean, Pythagorean Theorem, 45-45-90 & 30-60-90 Triangles Find the missing length indicated. Leave your answer in simplest radical form. 1) 48 x 64 2) 15 9 x Find the missing side of each triangle. Round your answers to the nearest tenth if necessary. 3) x 32 40 4) 15 39 x 5) 30 x 50 6) 21 28 x-1-The 45-45-90 Triangle (Isosceles right triangle) – The ratio’s of the sides are 1:1: 2. The 30-60-90 Triangle – The ratio’s of the sides are 1: 3 : 2. Find the length of the missing side of each right triangle without using the Pythagorean Theorem. Method 1 - Use similar triangles and proportions. Method 2 - Use scale factor.

Geometry Chapter 7: Right Triangles and Trigonometry. Theorem 7.1. Pythagorean Theorem. Click the card to flip 👆. In a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the legs. c² = a² + b². Click the card to flip 👆. 1 / 21.Pythagorean Theorem. Triangles are often named according to the measure of the angles they contain. An acute triangle has three angles such that each of the three angles is less than \(90^{\circ}\). An obtuse triangle has two angles such that the measure of each of these angles is less than \(90^{\circ}\) and the measure of the third …Use the Pythagorean theorem to calculate the hypotenuse of a right triangle. A right triangle is a type of isosceles triangle. The hypotenuse is the side of the triangle opposite t...Conjecture. Hypotenuse. Proof. Theorem. 2. Multiple Choice. 30 seconds. 1 pt. What is the length of the hypotenuse of the right triangle? 4 ft. 6 ft. 8 ft. 10 ft. 3. Multiple Choice. 30 …The Pythagorean theorem describes a special relationship between the sides of a right triangle. Even the ancients knew of this relationship. ... Geometry (all content) 17 units · 180 skills. Unit 1. Lines. Unit 2. Angles. Unit 3. Shapes. Unit 4. ... Use Pythagorean theorem to find right triangle side lengths. 7 questions.

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The formula for calculating the length of one side of a right-angled triangle when the length of the other two sides is known is a2 + b2 = c2. This is known as the Pythagorean theo...In a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the legs. a²+b²=c², where c is always the hypotenuse. Pythagorean Triple. A set of three positive integers that satisfy the equation a²+b²=c². Common Pythagorean Triples and Some of their Multiples.7.1 Apply the Pythagorean Theorem Term Definition Example right triangle Theorem 7.1 Pythagorean ... Theorem Theorem 7.7 Geometric Mean (Leg) Theorem . CH. 7 Guided Notes, page 6 7.4 Special Right Triangles Term Definition Example isosceles right triangle Theorem 7.8 45°-45°-90°in a right triangle, the side that makeup the right angle. Pythagorean Theorem. in a right triangle, the sum of the squares of the two legs is equal to the squares of the hypotenuse. Hypotenuse. longest side of a right triangle, always opposite the right angle. The equation for the Pythagorean theorem is a + b = c. trigonometry. the study of the relationship between side lengths and angles in triangles. opposite leg. the leg across from a given acute angle in a right triangle. adjacent leg. the leg that touches a given acute angle in a right triangle. theta. the symbol θ used as a variable for an angle. sine/sin. Law of Cosines. relates the cosine of each angle to the side lengths of the triangle. Law of Sines. relates the sine of each angle to the length of the opposite side. geometry Unit 8: Right Triangles and Trigonometry. Special Right Triangles. Click the card to flip 👆. 45-45-90 Triangle and 30-60-90 Triangle.

Theorem 9.1: Pythagorean Theorem. In a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the legs. a²+b²=c², where c is always the hypotenuse. Pythagorean Triple. A set of three positive integers that satisfy the equation a²+b²=c².The 45-45-90 Triangle (Isosceles right triangle) – The ratio’s of the sides are 1:1: 2. The 30-60-90 Triangle – The ratio’s of the sides are 1: 3 : 2. Find the length of the missing side of each right triangle without using the Pythagorean Theorem. Method 1 - Use similar triangles and proportions. Method 2 - Use scale factor.If c squared equals a squared plus b squared, then the triangle is right. A triangle whose hypotenuse equals square root to two times the leg. A triangle whose hypotenuse equals 2 times the shorter leg and whose longer leg equals square root of three times the shorter leg. Opposite divided by hypotenuse. adjacent divided by hypotenuse.Unit test. Level up on all the skills in this unit and collect up to 1,900 Mastery points! In this topic, we'll learn about special angles, such as angles between intersecting lines and triangle angles. Next, we'll learn about the Pythagorean theorem. Finally, we'll find volume of curved 3D shapes like spheres, cones, and cylinders.Improve your math knowledge with free questions in "Special right triangles" and thousands of other math skills.Recognize the relationships of side lengths in special right triangles. Apply knowledge of special right triangles to real-world scenarios. Materials. Ziploc bags containing colored straws of different lengths. Use lengths so that not all combinations will result in a triangle. Calculators. Activity and extension activity sheets. Pencils ...Pythagorean Theorem. Triangles are often named according to the measure of the angles they contain. An acute triangle has three angles such that each of the three angles is less than \(90^{\circ}\). An obtuse triangle has two angles such that the measure of each of these angles is less than \(90^{\circ}\) and the measure of the third …1. If 6 square is the geometric mean between 4 and another number, then the number is. 1.5. Theorem 5-9. If the altitude to the hypotenuse of a triangle is drawn, the two triangles are similar to each other and similar to the given triangle. Study with Quizlet and memorize flashcards containing terms like Altitude of a triangle, Geometric mean ...Indices Commodities Currencies Stocks

Pythagorean Theorem & Special Right Triangles quiz for 9th grade students. Find other quizzes for Mathematics and more on Quizizz for free!

trigonometry. the study of the relationship between side lengths and angles in triangles. opposite leg. the leg across from a given acute angle in a right triangle. adjacent leg. the leg that touches a given acute angle in a right triangle. theta. the symbol θ used as a variable for an angle. sine/sin.If the altitude is drawn to the hypotenuse of a right triangle, then the two triangles formed are similar to the original triangle and to each other. Geometric Mean (Altitude) Theorem CD² = AD ⋅BD altitude = the product of the lengths (which add up …Some words are extra important. Enter capitalization, the perfect way to show just why such words are special. How adept are you at knowing what to capitalize? Take this quiz and f...This lesson or activity allows students to "discover" the special right triangle relationships of 45-45-90 and 30-60-90 triangles. Students will be in base groups, separate (one to each corner of the room), solve 4 triangles using the Pythagorean Theorem, return to their base group and come up with a conjecture.Before buying your first rental property, read the following 18 tips for buying rental property to set yourself up for success. Real Estate | Tip List WRITTEN BY: Kaylee Strozyk Pu...11 terms. annikawagner. Geometry Chapter 9: Right Triangles and Trigonometry. 9.1: The Pythagorean Theorem 9.2: Special Right Triangles 9.3: Similar Right Triangles 9.4: The Tangent Ratio 9.5: The Sine and Cosine Ratios 9.6: Solving Right Triangles 9.7: Law of Sines and Law of Cosines.Calculate the value of c in the right triangle above. 2. Multiple Choice. Calculate the value of h in the figure above. 3. Multiple Choice. Find the length of the missing side of the right triangle above. Already have an account? Pythagorean Theorem & Special Right Triangles Review quiz for 10th grade students.

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Terms in this set (8) Theorem 8-1: Pythagorean Theorem. If a triangle is a right triangle, then the sum of the squares of the lengths of the legs is equal to the square of the length of the hypotenuse. formula. a²+b²=c². pythagorean triple. a set of three positive integers that work in the pythagorean theorem.1. If 6 square is the geometric mean between 4 and another number, then the number is. 1.5. Theorem 5-9. If the altitude to the hypotenuse of a triangle is drawn, the two triangles are similar to each other and similar to the given triangle. Study with Quizlet and memorize flashcards containing terms like Altitude of a triangle, Geometric mean ...8.3 Geometric Mean (Leg) Theorem . 3 8.1: Geometric Mean HOMEWORK ... #15 #17 #19 #21 . 4 8.2: The Pythagorean Theorem and Its Converse “I can use the Pythagorean Theorem.” ... 7 8.3: Special Right Triangles “I can …Pythagorean Theorem & Special Right Triangles quiz for 9th grade students. Find other quizzes for Mathematics and more on Quizizz for free!The acute angles of an isosceles right triangle are both 458 angles.Another name for an isosceles right triangle is a 458-458-908 triangle. If each leg has length x and the hypotenuse has length y, you can solve for y in terms of x. x2 +x2 =y2 Use the Pythagorean Theorem. 2x2 =y2 Simplify. x =y Take the square root of each side. You have just ...Quiz 7 1 Pythagorean Theorem Special Right Triangles Geometric Mean Acing the New SAT Math Thomas Hyun 2016-05-01 SAT MATH TEST BOOK Book of Proof Richard H. Hammack 2016-01-01 This book is an introduction to the language and standard proof methods of mathematics. It is a bridge from the computational courses (such as calculus …Worksheet. Print Worksheet. 1. The converse of the Pythagorean Theorem says what? Right triangles must follow the formula a 2 + b 2 = c 2. If a triangle follows the formula a 2 + b 2 = c 2, then ...Preview this quiz on Quizizz. A square has side length 95. What is the length of the diagonal of the square? Express your answer in simplest radical form. More of Special Right Triangles & Pythagorean Theorem. DRAFT. 9th - 11th grade. 0 times. Other. 0% average accuracy. 2 hours ago. mgregory. 0. Save. Edit.PAP - UNIT 8 (PART 1) - SPECIAL RIGHT TRIANGLES & GEOMETRIC MEAN Name: Per: Video Due Dates: Assessment Dates: ** VIDEOS MUST BE WATCHED BEFORE THIS CLASS ** ** PERIOD DATE ** 1/7 Quiz Special Right Triangles 1/4 Video #1 Simplifying Radicals 1/12-1/13 Unit 8 (Pt 1) Special Rt ’s & Geo Mean 1/4 Video #2 …If a triangle is a right triangle, then the sum of the squares of the lengths of the legs is equal to the square of the length of the hypotenuse. (leg1)2 + (leg2) 2 = (hypotenuse)2. a2 +b2 =c2. Pythagorean triple. Set of 3 nonzero whole numbers a, b, and c that satisfy the Pythagorean Theorem. Theorem 8-2 (Converse of the Pythagorean Theorem)Given: Isosceles right triangle XYZ (45°-45°-90° triangle) Prove: In a 45°-45°-90° triangle, the hypotenuse is times the length of each leg. Because triangle XYZ is a right triangle, the side lengths must satisfy the Pythagorean theorem, a2 + b2 = c2, which in this isosceles triangle becomes a2 + a2 = c2. By combining like terms, 2a2 = c2. ….

Use the Pythagorean Theorem to see if the measurements below can form a right triangle. **** a= 6 cm, b= 8 cm, c = 10 cm Yes, it is a right triangle. No, it is not a right triangleLaw of Cosines. relates the cosine of each angle to the side lengths of the triangle. Law of Sines. relates the sine of each angle to the length of the opposite side. geometry Unit 8: Right Triangles and Trigonometry. Special Right Triangles. Click the card to flip 👆. 45-45-90 Triangle and 30-60-90 Triangle.Geometry- Unit 7: Right Triangles and Trigonometry. Pythagorean Theorem. Click the card to flip 👆. a²+b²=c². Click the card to flip 👆. 1 / 11. Unit 8 Part 1 - Pythagorean Triples, Pythagorean Theorem and its Converse, Special Right Triangles. Flashcards; Learn; Test; Match; ... Verbal Quiz Math Terms. 15 terms. Fill in the Blank. Use the 45-45-90 theorem to solve for the hypotenuse. Already have an account? Pythagorean Theorem and Special Right Triangles (8-1) quiz for 9th grade students. Find other quizzes for Mathematics and more on Quizizz for free!The Pythagorean Theorem Eli Maor 2019-11-19 An exploration of one of the most celebrated and well-known theorems in mathematics By any measure, the Pythagorean theorem is the most famous quiz-7-1-pythagorean-theorem-special-right-triangles-geometric-mean 2Terms in this set (26) *Used to find the missing SIDES of a RIGHT triangle. *Sides a and b are called the legs. *Side c is the hypotenuse. *If c^2 = a^2 + b^2, then it is a RIGHT triangle. *If c^2 > a^2 + b^2, then it is an OBTUSE triangle because the "hypotenuse" has been stretched out. 11 terms. annikawagner. Geometry Chapter 9: Right Triangles and Trigonometry. 9.1: The Pythagorean Theorem 9.2: Special Right Triangles 9.3: Similar Right Triangles 9.4: The Tangent Ratio 9.5: The Sine and Cosine Ratios 9.6: Solving Right Triangles 9.7: Law of Sines and Law of Cosines. Quiz 7-1 pythagorean theorem special right triangles & geometric mean, Quiz yourself with questions and answers for Pythagorean Theorem and Special Right Triangles quiz, so you can be ready for test day. Explore quizzes and practice tests created by teachers and students or create one from your course material., Learn. Test your understanding of Pythagorean theorem with these NaN questions. The Pythagorean theorem describes a special relationship between the sides of a right triangle. Even the ancients knew of this relationship. In this topic, we’ll figure out how to use the Pythagorean theorem and prove why it works. , in a right triangle, the side that makeup the right angle. Pythagorean Theorem. in a right triangle, the sum of the squares of the two legs is equal to the squares of the hypotenuse. Hypotenuse. longest side of a right triangle, always opposite the right angle. The equation for the Pythagorean theorem is a + b = c., Part 1: Find the missing side of each triangle. Leave your answers in simplest radical form. ______________1) . ______________2) . ______________3) . ______________4) . …, The Pythagorean theorem is a 2 + b 2 = c 2 , where a and b are lengths of the legs of a right triangle and c is the length of the hypotenuse. The theorem means that if we know the lengths of any two sides of a right triangle, we can find out the length of the last side., Study with Quizlet and memorize flashcards containing terms like if a squared plus b squared is greater than c squared, then the triangle is, is a squared and b squared are less than c squared, then the triangle is, Pythagorean triple and more., Quiz 8-1: Pythagorean Theorem/Special Triangles/Trig Ratios quiz for 9th grade students. Find other quizzes for Mathematics and more on Quizizz for free!, Take this quiz and find out how much you know about famous artists and their work! Advertisement Advertisement Advertisement Advertisement Advertisement Advertisement Advertisement..., Given: Isosceles right triangle XYZ (45°-45°-90° triangle) Prove: In a 45°-45°-90° triangle, the hypotenuse is times the length of each leg. Because triangle XYZ is a right triangle, the side lengths must satisfy the Pythagorean theorem, a2 + b2 = c2, which in this isosceles triangle becomes a2 + a2 = c2. By combining like terms, 2a2 = c2. , The Pythagorean theorem describes a special relationship between the sides of a right triangle. Even the ancients knew of this relationship. In this topic, we’ll figure out how to use the Pythagorean theorem and prove why it works., Pythagorean Theorem and Special Right Triangles. 1. Multiple Choice. 2. Multiple Choice. Sides a and b are called legs. 3. Multiple Choice. Side c on a right triangle is ALWAYS the longest., Jan 23, 2019 ... Triangles: Similar Right Triangles, Geometric Mean ... Special Right Triangles made easy! ... Pythagorean Theorem and Special Right Triangles., right triangle with Pythagorean Theorem. a^2 + b^2 = c^2. Pythagorean Triples. 3,4,5 and 5,12,13 and 8,15,17 and 7,24,25 (have to work in pythagorean theorem and are whole numbers) Hypotenuse. The longest side of a right triangle. Study with Quizlet and memorize flashcards containing terms like 45-45-90 triangle, 30-60-90 triangle, Area of a ..., 1. Multiple Choice. You are making a guitar pick that resembles an equilateral triangle with side lengths of 32 millimeters. What is the approximate height of the pick? (hint: use 30-60-90 theorems) 2. Multiple Choice., Segment from a vertex that is perpendicular to the opposite side or to the line containing the opposite side. Segment/ray that bisects one of the angles of a triangle, creates two congruent angles. a midsegment of a triangle is parallel to a side of the triangle, and its length is half the length of that side., Conjecture. Hypotenuse. Proof. Theorem. 2. Multiple Choice. 30 seconds. 1 pt. What is the length of the hypotenuse of the right triangle? 4 ft. 6 ft. 8 ft. 10 ft. 3. Multiple Choice. 30 …, Unit 8 Part 1 - Pythagorean Triples, Pythagorean Theorem and its Converse, Special Right Triangles. Flashcards; Learn; Test; Match; Q-Chat; Flashcards; ... Special right Triangles Geometry B Unit 4. Teacher 5 terms. helphander. ... Verbal Quiz Math Terms. 15 terms. Lauren_Russ6. Preview. chem test unit 2. 6 terms. maripozuh., Created by. jolrod24. - Simplify radicals - Determine the range of the third side of a triangle given the values of 2 of the sides - Determine whether a set of numbers can be the measures of the sides of a triangle using Triangle Inequality Theorem. If so, classify the triangle as acute, right, or obtuse using the Pythagorean Theorem Converse. , Study with Quizlet and memorize flashcards containing terms like To find the geometric mean of 8 and 12, we would first set up this proportion., The altitude drawn from the vertex to the hypotenuse of a right triangle is the _____ _____ of the two segments of the hypotenuse., When two sides of a right triangle are known, the third side can be found using the _____ _____ . and more. , Use trigonometric ratios and the Pythagorean Theorem to solve right triangles in applied problems. WORKSHEETS: Regents-Pythagorean Theorem 1a IA/GE/A/B graphics, bimodal: 7/3/1/1: TST PDF DOC: Regents-Pythagorean Theorem 1b IA/GE/A/B graphics, MC: TST PDF DOC: Regents-Pythagorean Theorem 2a IA/A without graphics, bimodal: 7/4: TST PDF DOC ..., Math. Geometry questions and answers. Name: Geometry Unit 8: Right Triangle Trigonometry Date: Per: Quiz 8-1: Pythagorean Theorem. Special Right Triangles, & …, The descending triangle is a pattern observed in technical analysis. It is the bearish counterpart of the bullish ascending triangle. The descending triangle is a pattern observed ..., Chapter 9 Right Triangles and Trigonometry Geometry Student Notes 7 Example 4: How high is the end of a 54-foot ramp when the tipping angle is 30°? Concept Summary: – Sometimes special case right triangles can be solved using Pythagorean theorem – Sides opposite special angles summarized in table below: Angle Side Opposite 30° 1 2, The Pythagorean Theorem Eli Maor 2019-11-19 An exploration of one of the most celebrated and well-known theorems in mathematics By any measure, the Pythagorean theorem is the most famous quiz-7-1-pythagorean-theorem-special-right-triangles-geometric-mean 2, Feb 12, 2024 ... Chapter 9 Practice Test| Right Triangles and Trigonometry| Pythagorean Theorem, Special Right Triangles, Trigonometry., Pythagorean Theorem & Special Right Triangles quiz for 9th grade students. Find other quizzes for Mathematics and more on Quizizz for free!, For most my life, I had no idea what emotions were, why they were necessary, or what I was supposed to do with For most my life, I had no idea what emotions were, why they were nec..., Pythagorean Theorem quiz for 8th grade students. Find other quizzes for Mathematics and more on Quizizz for free! ... Will this make a right triangle. yes. no. maybe. 22. 3. Multiple Choice. Edit. 2 minutes. 1 pt. Do the segment lengths 9, 11 and 15 cm form a right triangle? yes. no. maybe. pythagoras. 4. Multiple Choice. Edit. 2 minutes. 1 pt., Segment from a vertex that is perpendicular to the opposite side or to the line containing the opposite side. Segment/ray that bisects one of the angles of a triangle, creates two congruent angles. a midsegment of a triangle is parallel to a side of the triangle, and its length is half the length of that side., Side lengths of a right triangle that are all whole numbers. 45-45-90. Special right triangle formed by bisecting a square along its diagonal. 30-60-90. Special right triangle formed by drawing an altitude of an equilateral triangle. The relationship of the length of the legs of a 45-45-90 triangle. congruent., Start studying chapter 8 (part 1)- geometric mean, pythagorean theorem and its converse, & special right triangles. Learn vocabulary, terms, and more with flashcards, games, and other study tools., Common Misconceptions about Pythagorean Theorem and Special Right Triangles. While the Pythagorean theorem and special right triangles are important concepts in geometry, there are several common misconceptions that students may have. It’s important to address these misunderstandings to ensure a solid understanding of these topics. 1., A right triangle where the sides are in the ratio of the integers 5:12:13. 45-45-90 Right Triangle. - 2 shorter sides are equal in length "n". - hypotenuse = (n) (√2) 30-60-90 Right Triangle. - shortest side is opposite 30° angle. - medium side is opposite 60° angle. - longest side is opposite 90° angle. Perimeter of a triangle.