Which of the following is the solution set of the problem?
O (-0, -3)
0 (-0, -3]
0 1–3,0)
O
(-3,0)

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?