For the given image and scale factor, which ordered pair is one of the pre-image vertices if the center of the pre-image is also the origin? A) (3/5,1)
B) (5/3,1)
C) (1,1)
D) (5,1)

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?