Trigonometry can be used to find the length of a side in a triangle. Trigonometry close trigonometryThe study of sides and angles in triangles. can be used to find a missing side in a right-angled ...

One idea he came up with was a mathematical equation ... is that in a right triangle (where one angle equals 90°), the sum of the squares of two sides equals the square of the hypotenuse (the ...

which states that the sum of the squares of a right triangle's two shorter sides are equal to the square of the triangle's ...