Susan was baking a lava cake in the shape of a square pyramid with a slant height of 4 inches and a base of 6 inches. she wants to cover the sides with melted chocolate. how much chocolate does she need?

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?