Is the triangle a right triangle?

Use the Pythagorean theorem: a triangle is right if the squares of its two shorter sides add to the square of its longest side. Here, 9² + 40² = 81 + 1,600 = 1,681, and 41² = 1,681. So the triangle is right, matching “Yes, 9² + 40² = 41².”

AI-written and checked against the verified answer.