The Radius of a Circle and Pi.

      We all know Pi is 3.14, and we all know circles are round. Well, you should know. How big is a circle? That is our main question today. We are trying to figure out how big a circle is or a circle's circumference. You find the circumference by multiplying pi (3.14) and the diameter. Lets say we know the radius is 3...inches. Our diameter would be 6 inches because the radius is half of the diameter. So multiply 3.14 and 6 and get 18.84. Your circle's circumference would be 18.84. It's really easy to find circumference,