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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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โˆ™ 2011-01-09 07:54:22
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Q: What is the area and perimeter of circle?
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