Sondra wants to put a fence in a triangular area of her backyard as shown in the illustration. the fence will enclose a right triangle, with two of the sides measuring 8 yards and 15 yards long. how long will the third side of the triangle be? (the question did not contain an illustration)

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?