-- Take the formula for the area of the circle in terms of the radius . . . A = (pi) R2
-- Solve that formula for 'R'. You'll then have a formula for the radius in terms of the area,
which is exactly what you're looking for.
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If yo have the area of the circle, the square is irrelevant. Radius = sqrt(Area/pi)
If 'R' is the radius of the circle, then-- area of the circle is [ pi R2]-- perimeter of the circle is [ 2 pi R ]
112cm2
The radius of a circle is the distance from the center to any point on the circle. The area is the space within the circle. The formula to find the area is πr2. r stands for the radius of the circle. If you want to find the radius, you can work backwards from the area or the circumference, which is the perimeter of the circle. The formula for circumference is 2πr.
Circumference of a circle = 2*pi*radius or diameter*pi Area of a circle = pi*radius squared