Amy was looking at a table of conversions from meters to kilometers. the table showed that 2 kilometers are equivalent to 2,000 meters. how can she determine how many kilometers are equivalent to 8,000 meters? explain.

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?