Question

Which set of three numbers could represent the lengths of the sides of a right triangle?

A.

7, 24, 25






B.

8, 9, 10






C.

9, 11, 14






D.

15, 18, 21

Answer 1

All you have to do is use the Pythagorean theorem (a² + b² = c²) on all of them. Since, the hypotenuse is always the longest side, use the biggest number for c.
A: 7² + 24² = 25²
49 + 576 = 625
625 = 625

Luckily, the answer is A.