|-67.05 – 42.98| – (29.80 + 45.83) a. 30.04 b. 34.04 c. 34.40 d. 44.04

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?