The circumference of a circle is the distance around the circle. The formula is: C = pi * d (where pi = 3,1416 and d is the diameter)
The diameter of a circle is the distance across the circle.
The radius of a circle is one-half of the diameter
The area of the circle is the amount of space contained within the circle. To calculate, the formula is: A = pi * r-squared (where pi = 3.1416 and r-squared is the radius multiplied by itself)
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