Arectangular prism has a length of 3 1/2 in., a width of 3 1/2 in., and a height of 7 in. danny has a storage container for the prism that has a volume of 90 in³. what is the difference in volume between the prism and the storage container?

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?