The radius will turn out to be the square root of the area divided by pi which in this case is about 4.51351666838205 cm
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Area of a circle = pi*radius squared
The area of a circle is pi * radius2. If you already have the radius squared, you just have to multiply that by pi.
Area of a circle in square cm = pi*radius squared
In a circle, the area of the circle is pi times the radius squared
Area of a circle = pi*radius squared Circumference of a circle = 2*pi*radius or diameter*pi