Area of a circle = radius x radius x pi
"Pi" is a constant number and is equal to 3.14159265 (taken out to 8 decimal places) Usually just 3.14 is good. For more precision, 3.1416 is often used.
"Pi" is good for finding the area of any circle, anywhere.
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Area of Circle = pi (radius)2 So , using this formula we can find the radius and also the diameter. Diameter = 2(radius)
Radius is the square root of (area divided by pi).
It depends on the values you have. The base of a cylinder is a circle. If you know the circle's diameter, half it to find the radius. If you know the circle's circumference, divide by 2pi to find the radius. If you know the circle's area, divide by pi and take the square root to find the radius.
Area of a circle equals pi r2 Therefore the radius of a circle equals the square root of (area divided by pi).
The only piece of information required to find the area of a circle is the radius of the circle. Once you know the radius of the circle, the area is simply the radius squared multiplied by pi (approximately 3.14).