Answer
True.
Work Step by Step
In a right triangle, the square of the length of the longest side equals the sum of the squares of the lengths of the other two sides. This is true by the Pythagorean theorem.
In equation form, we can state this as:
For a right triangle with legs a, b and the hypotenuse c, the Pythagorean theorem states:
$$c^2=a^2+b^2.$$
