Question

A triangle has sides of lengths 13, 21, and 24. Is it a right triangle? Explain.

Answer 1

yes; 132 + 212 ≠ 242
no; 132 + 212 = 242
no; 132 + 212 ≠ 242
yes; 132 + 212 = 242

Answer 2

The sum of the squares of the smaller sides should equal the square of the largest side. Do they? If they do, then yes, it is a right triangle. If they don't then no, it is not a right triangle.

Answer 3

Does \[13^{2}+21^{2}=24^{2}\]