A triangle has sides 5, 12, and 13. Is it a right triangle?
✓ Correct Answer: Option A
Check: 5² + 12² = 25 + 144 = 169 = 13². Since a² + b² = c², it is a right triangle.
Check: 5² + 12² = 25 + 144 = 169 = 13². Since a² + b² = c², it is a right triangle.