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.
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What is the radius of the circle with this area?
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We know that the area of a circle is Pi times the radius squared, so the radius squared must be 81.
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That means the radius is the square root of 81, which is 9
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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.