Leg lengths of a 45°-45°-90° Special Right Triangle are equal
Hypotenuse length = Leg length * √2
Hypotenuse length = 5√2 * √2
Hypotenuse length = 5 * 2
Hypotenuse length = 10
Hypotenuse length = Leg length * √2
Hypotenuse length = 5√2 * √2
Hypotenuse length = 5 * 2
Hypotenuse length = 10