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With right triangles. To find side length of a, b and c.a2 + b2 = c2=========
The checking for right-angled triangles is RHS:Right angle - they both haver a right angleHypotenuse - the hypotenuse of the triangles are congruentSide - a corresponding side of the triangles are congruent.
It is the largest side
If the 2 triangles are right triangles, which are congruent to slicing the rectangle on the diagonal, then arrange one on top of the rectangle, and the other to the side, so that the two hypotenuses are in line with each other. This will make a bigger right triangle, which is similar to the smaller right triangles - each side is double of the smaller triangles.
The Pythagorean Theorem is used to find side lengths of right triangles. It came from the Greek philosopher and mathematician Pythagoras.