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.
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Math, Geometry Problem 1193: 3-4-5 Right Triangle, Congruent Circles, Tangent, Radius. Tiled background image: Intihuatana, Machu Picchu. Math teacher Master Degree. College, Online math tutor.