The area of the (inside) of a circle - the circle itself is a line with no area - is calculated by:
pi * r2
the perimeter - also called the circumference is the length around the circle and is calculated:
2 * pi * r
where "r" is the radius, the distance from the center to the edge of the circle and "pi" is the irrational number 3.14159....
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Area of any circle = pi*radius2
Of a circle,the area is: Pi * r^2,perimeter is: 2* Pi * rWhere, r is the distance from the circle's center to the perimeter, and Pi is a constant: Pi ~ 3.14.
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zero is the least area and the max area, is of a circle of perimeter 40 .....
There are different formula for: Height, Area, Perimeter, Angle, Length of Median Radius of inscribed circle Perimeter of inscribed circle Area of inscribed circle etc.