We know that 2πr=circumference (or πxdiameter)
So simply re-arrange the equation to get r=circumference/2π
Now that you have r, πr^2=area
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The circumfrence is like a perimeter. It is the area around a circle. You can find the circumfrence of a circle by using this formula. Pi x R2 or Pi times the radius squared.
The circumference of a circle is (diameter) multiplied by (pi).
If you mean of a circle then they are as follows:- Circumference = 2*pi*radius or diameter*pi Area = pi*radius squared
two times the radius times pi
the formula to find the circumference of a circle is pi times the diameter. So basically take the diameter and multiply it by 3.14 and that's the circumference.