Leg lengths of a 45°-45°-90° Special Right Triangle are equal
Hypotenuse length = Leg length * √2
Hypotenuse length = 12√2 * √2
Hypotenuse length = 12 * 2
Hypotenuse length = 24
Hypotenuse length = Leg length * √2
Hypotenuse length = 12√2 * √2
Hypotenuse length = 12 * 2
Hypotenuse length = 24