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en.wikipedia.org/wiki/Area_of_a_circle

In geometry, the area enclosed by a circle of radius r is πr2. Here the Greek letter π represents a constant, approximately equal to 3.14159, which is equal to the ratio of the circumference of any circle to its diameter. One method of deriving this formula, which originated with Archimedes, ...

www.khanacademy.org/math/basic-geo/basic-geo-area-and-perimeter/area-circumference-circle/v/area-of-a-circle

The area of a circle is pi times the radius squared (A = π r²). Learn how to use this formula to find the area of a circle when given the diameter.

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

Area of a Circle. Calculator. Enter the radius, diameter, circumference or area of a Circle to find the other three. The calculations are done "live":.

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

Area of a circle, formula for area explained with examples, pictures, interactive examples and quiz.

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

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

This relationship is expressed in the following formula: diam_formula.gif . circle grid The area of a circle is the number of square units inside that circle. If each ...

www.wikihow.com/Calculate-the-Area-of-a-Circle

A common problem in geometry class is to have you calculate the area of a circle based on provided information. You need to know the formula for finding the ...

www.1728.org/diamform.htm

Formulas for Circle Circumference, Circle Area, Sphere Area, Partially Filled Sphere Area, Partially Filled Sphere Volume, Sphere Volume, Cylinder Area, ...

www.ask.com/youtube?q=Formula+for+Area+of+Circle&v=YokKp3pwVFc
Mar 18, 2011 ... Read a more complete explanation here: http://pythagoreanmath.com/complete- explanation-for-area-of-a-circle-formula/ πr(squared) gives you ...