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jmc

prealgebra senior

Problem

The circumference of a particular circle is 18 cm. In square centimeters, what is the area of the circle? Express your answer as a common fraction in terms of .
Solution
If is the radius of the circle, then the circumference is . Setting equal to 18 cm, we find cm. The area of the circle is square centimeters.
Final answer
\dfrac{81}{\pi}