Step-by-step explanation:
I don't have the best handwriting and it's a bit messy. However, Pythagoras Theorem states that in a right angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides. So, to find the unknown length of one side, you'll subtract the squared length given for the other side from the squared length of the hypotenuse. The hypotenuse is longest side, so I couldn't add the 4ft to the 24ft. I guess it is just 24 ft then.
