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Nikita wants to apply for student aid to fund her college education. arrange the steps involved in nikita’s application for financial aid

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?

What is the solution for 6 - 7/8? explain the steps.