What is the surface area of the bottom of a circular storage tank that has a circumference of 314 feet?

314 divided by pi, 3.14

314/3.14 = 100

So the diameter is 100 feet.

100 divided by 2 = 50, which is the radius

pi times radius2 = area of circle

50 x 50 = 2,500

2,500 x 3.14 = 7,850 ft2

TA DA!!! 7,850 square feet!!!!!!!!!!!!!