The area of a circle with the given radius.
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Area of a circle
pi radius squared. (radius squared, then multiply by pi.)
It is its square area which is found by pi*radius squared
4 * pi * radius * radius or (pi * diameter * diameter) / 3 Also ( 4 * 3.14 * radius squared ) Also ( 88/7 * 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.