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Area of a Circle

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Last modified by
on
Jun 30, 2023, 1:51:30 PM
Created by
on
Dec 27, 2013, 7:23:11 PM
`A = pi*r^2`
`(r) "radius"`
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e6cbb3a8-da27-11e2-8e97-bc764e04d25f

The Area of a Circle equation (A = π•r²)CIRCLE PARTS  /attachments/e6cbb3a8-da27-11e2-8e97-bc764e04d25f/CircleStack.png computes the area of a circle.

INSTRUCTIONS:  Choose units and enter the following:

  • (r) - Radius of the circle

Area of a Circle (A): The calculator computes the area (A)  in square meters.  However, this can be automatically converted to many other area units (e.g. square inches) via the pull-down menu.

References


Circle Calculators

The Math

The formula for the area of a circle is:

          A = π•r²

where:

A circle is a simple shape in Euclidean geometry. It is the set of all points in a plane that are at a given distance from a given point, the center; equivalently it is the curve traced out by a point that moves so that its distance from a given point is constant. The distance between any of the points and the center is called the radius.
A circle is a simple closed curve which divides the plane into two regions: an interior and an exterior. In everyday use, the term "circle" may be used interchangeably to refer to either the boundary of the figure, or to the whole figure including its interior; in strict technical usage, the circle is the former and the latter is called a disk.
A circle may also be defined as a special ellipse in which the two foci are coincident and the eccentricity is 0, or the two-dimensional shape enclosing the most area per unit perimeter, using calculus of variations.

For other area calculators see:


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