You can
put this solution on YOUR website!The area of a circle is
, so if you are given the area and need to determine the radius, you simply solve this equation for r, thus:
Divide both sides by
Take the square root of both sides
Remember that, in general, when you take the square root of something you have to consider both the positive and negative square roots:
AND
. However, in this case you can exclude the negative square root because you are trying to find a length measurement, and a negative number for a length measurement is absurd.
The other thing to consider when presenting your answer is that the Area was given in
. Taking the square root of a quantity measured in
means that your result will be in cm.
Hope this helps,
John
