You can put this solution on YOUR website! Circumference = (pi) multiplied by diameter
Because the diameter is 420ft, the circumference is
420 * = 1319.4689ft
Rounding this we get 1319.47ft for the circumference.
(the number is a very special number, used a lot in work on circles. It is approximately 3.14159265.... (those dots indicate that it goes on forever) you sometimes have a special button on your calculator to show it! If not you can always use 3.142!)
