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en.wikipedia.org/wiki/Area_of_a_circle

In geometry, the area enclosed by a circle of radius r is π r2. 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.mathwarehouse.com/geometry/circle/area-of-circle.php

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

www.mathgoodies.com/lessons/vol2/circle_area

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

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.purplemath.com/modules/sectors.htm

Explains formulas for areas of sectors of circles and lengths of arcs. Demonstrates how to use the formulas in each of degrees and radians.

www.mathwords.com/a/area_sector_circle.htm

Area of a Sector of a Circle. The formula is given below. ... Mathwords: Terms and Formulas from Algebra I to Calculus written, illustrated, and webmastered by ...

www.math.com/tables/geometry/circles.htm

arc: a curved line that is part of the circumference of a circle ... Area of Circle Sector: (with central angle theta ) ... Equation of Circle: (Cartesian coordinates)