Question

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

Answer 1

a 7, 9, 11
b 8, 15, 17
c 10, 15, 20
d 12, 18, 22

Answer 2

To be a right triangle, the longest side squared has to equal the sum of each of the other 2 sides squared. That's the Pythagorean theorem.
For example. 3, 4, 5 can be the sides of a right triangle since