Kisha her teacher put away 36 books in boxes. she had to put the same number of books in each box to make the boxes easy to carry. how many books could be in each box?

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?