Xavier collected data and found that the number of cat adoptions are related to how many scoops of ice cream people eat. His professor asked him when he collected his data, and Barnaby said he collected it during the hottest week of summer. Summer is potentially a:

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?