Identify the dimensions of A. A - 2 x 3
B - 3 x 3
C - 0 2 -3
D - 2 x 2

(I have the same questions on my account so answer them all for lots of points)

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?