Above are two different models of the same rectangle. If the length of the model on the top is 6 cm, what is the length of the model on the bottom?

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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?

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