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www.mathgoodies.com/lessons/vol2/circle_area.html

is the radius. Let's look at some examples involving the

www.mathsisfun.com/geometry/circle-area.html

www.onlineconversion.com/shape_area_circle.htm

www.khanacademy.org/math/geometry/hs-geo-foundations/hs-geo-area/v/area-of-a-circle

The

www.virtualnerd.com/pre-algebra/perimeter-area-volume/circles/circle-sector-area-examples/circle-area-from-diameter

Note: If you have the diameter

www.reference.com/math/calculate-square-footage-circle-4ff067474032a974

... by the formula: A = π r2. You can easily

www.basic-mathematics.com/area-of-a-circle-calculator.html

Given the radius, use this

www.mathwarehouse.com/geometry/circle/area-of-circle.php

www.regentsprep.org/regents/math/geometry/gp16/circlesectors.htm

Let's review what we know about the

www.easycalculation.com/area/circle.php

The Circumference is the distance once around the

Answer

More Info

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Six Methods:

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This