Make a 3,4,5 Triangle Connect three lines And you will have a right angle (90) You can use other lengths by multiplying each side by 2. Or by 10. Or any multiple.
Pythagorean Theorem
3 4 5 Right Triangles – Explanation & Examples
3, 4, 5 Triangle
3-4-5 Triangles, Definition, Rule & Angles - Lesson
3-4-5 Triangle Identity - GMAT Geometry - Apex GMAT Blog
Construct a Triangle with a given a perimeter in the ratio 2:3:4
3-4-5 Triangle, Definition, Rules & Examples
3, 4, 5 Triangles – Visual Fractions
Section 4.3: Right Triangle Trigonometry