SOLUTION: If the circumference of a circle is 18pie , what is the area(in terms of pie)?

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Question 508610: If the circumference of a circle is 18pie , what is the area(in terms of pie)?
Answer by tinbar(133) About Me  (Show Source):
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circumference = 2*pi*r.
Since we know the circ is 18*pi we can deduce the radius is 9.
Area = pi*r^2. 9^2=81. Therefore the area, in terms of pi, is 81pi