Question

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 4007 m.
What is the diameter d of the lake?
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Answer 1

The diameter is about 1,275.4 because D=C/pi so 4007\pi=1275.4