Which fraction is not equivalent to 4/12?
a. 1/3 b. 12/30 c. 8/24 d. 16/48

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?