Area of Circle given Radius

To find the area of a circle when given a radius you can use the equation:

To find the area of a circle when given a radius you can use the formula below. The variable r corresponds with the distance from the center of the circle to the edge of the circle. The number π can be approximated as 3.14.

For example, if the radius of a circle is three units the area is calculated by substituting 3 in for .

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Area | concept
Circle | concept