Math CentralQuandaries & Queries


Question from Shelby:

What's the radius of a circle that has an area of 803.84cm2? I also need examples of how you got the answer.

Hi Shelby,

The area $A$ of a circle in square centimeters is given by

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

where $r$ is the radius of the circle in centimeters. You know the values of $\pi$ and $A$ and hence you can solve for $r.$

You can verify your answer. Once you have found $r$ use the area formula to find $A.$ Did you get $A = 803.84$ square centimeters?


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