If the area of a circle is known, the radius can be determined using the area formula: A =π r2, (r = radius, π = to 3.14)
A/Ï€ = r2,
√(A/π) [divide the Area by π, then find the square root of the result ] = r,
Then, find the diameter (twice the radius): d = 2r.
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Circumference= 3.14 x Diameter Area of circle= 3.14 x diameter x diameter
Area = Pi(d/2)2 where d = diameter
Area of Circle = pi (radius)2 So , using this formula we can find the radius and also the diameter. Diameter = 2(radius)
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radius = diameter/2 area of a circle in square units = pi*radius2