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Mathematics 15 Online
OpenStudy (anonymous):

What is the area of a circle with a radius of 9 cm? A. 81π cm2 B. 18π cm2 C. 9π cm2 D. 324π cm2

OpenStudy (anonymous):

\[\huge A = \pi r^2\]

OpenStudy (anonymous):

Just plug in the r and square it.

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