Basically can you do pythagoras on it 40 would have to be the hypotenuse as it’s the largest, so if 9^2 + 37^2 = 40^2 then we have a right triangle 9^2 + 37^2 = 1450 40^2 = 1600 1450 doesn’t equal 1600, so those side lengths don’t make a right triangle
