If you mean of a circle then they are as follows:-
Circumference = 2*pi*radius or diameter*pi
Area = pi*radius squared
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The circumfrence is like a perimeter. It is the area around a circle. You can find the circumfrence of a circle by using this formula. Pi x R2 or Pi times the radius squared.
radius=13 area=40.82 circumfrence=8.28025477707
Multiply pi by the diameter.
Pi x the diameter of the circle will hive you the circumference. The diameter is double the radius so the answer to your question is pi2r.
Approximately 86.7 units squared.