a trader bought 132 oranges at $20 each, and sold them at $32 each, where c is the currency. if all reckonings are in base four, the profit is​

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?