A circle with a diameter of 12 inches has an area of 113.1 square inches.
A circle has an area equal to its radius squared times pi. Your circle has a radius of 6 inches (half the diameter)
6 X 6 X 3.14159...
=
113.097336
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Area of the circle: pi*6 squared = 36*pi square inches
Circumference = 37.7 inches Diameter = 12 inches
How many cubic yards in an 12 foot diameter circle with a 4 inch thickness?
The area of a circle with a diameter of 12 inches is: 113.1 square inches.
6 inches