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The circumference of a circle is the distance arround the edge of the circle. The area of a circle is how big the inside of the circle is.
The equation for the circumference of a circle is pi times radius squared.
The area of a circle that has a circumference of 16pi is: 201.1 units2
If the area of a circle is 28.26 the circumference is: 18.84 units.
The area of a circle, if its circumference is 20π, is: 314.16 square units.