45-45-90 Triangles Page 1 of 5
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What is a 45-45-90 Triangle?
What do you know about a square? All 4 sides are the same length. Since a 45-45-90 triangle is half of a square, this means that the two sides that form the 90 degree angle are the same length.
For this reason, a 45-45-90 triangle is often referred to as an isosceles right triangle. If you know one of the legs of a 45-45-90 triangle, the other leg will be the same.
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