Calculate the Area of a Circle

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This will calculate the area of a circle based on its diameter. Confused as to what diameter means? Scroll down for a diagram.

Diameter

cm

Diameter

ft

in

Diameter

meters

Diameter

yards

Units

Area of a 10′6″ diameter circle

86.590square feet 12,469square inches 9.6211square yards 0.0019878acres 8.0445square meters 80,445square centimeters

results may be rounded

Area of a Circle Formula

The area of a circle is pi times the square of its radius. The radius is half the diameter.

Area = π * (Diameter / 2)2

Diameter of a Circle

The diameter of a circle is the distance from one edge to the other, passing through the center. It is twice the radius.

Diameter

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