A circle is a set of points equal distance from a single center point. 

The distance around the circle is known as the Circumference. The ratio of the circumference and the diameter create the number known as pi. 
The distance
from one side of the circle through the middle is known as the diameter.

The
distance from the center 

using either of these formulas.

If r = 3 then a = 9(3.14) = 28.26 
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