Ted is building a garden in his yard he measures one side of his yard and finds it 12 meters which measurement did ted find A) Area
B) Length
C) Perimeter

PLEASE ANSWER

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?