Answer:
Sum, Shorter, and Longest.
Explanation:
A Pythagorean triple
is a set of three positive whole numbers which satisfy the equation

Many ancient societies employed Pythagorean triples like (5,6,7) to precisely create right angles: if a triangle has sides of lengths 5, 6, and 7 units, respectively, the angle opposite the side of length 5 units is therefore a right angle.