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Finding the radius of a circle from area equation

Teaching Transcript

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What is the radius of the circle with this area?

We know that the area of a circle is Pi times the radius squared, so the radius squared must be 81.

That means the radius is the square root of 81, which is 9

This math skill teaches how to find the radius of a circle by using the area formula. First, rearrange the area formula to solve for the radius squared, then take the square root to find the radius.

Skill Practice

Finding the radius of a circle from area equation

Test your understanding of finding the radius of a circle from area equation by practicing it! Work through the below exercises to use it in practice.