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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.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":.

virtualnerd.com/geometry/length-area/circles-sectors-area/circle-area-from-diameter

Note: If you have the diameter of a circle, you can use it to find the area of that circle. Just plug that value into the formula for the area of a circle and solve.

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.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.math.com/tables/geometry/surfareas.htm

In general, the surface area is the sum of all the areas of all the shapes that cover the surface of the object. ... That's the formula for area of a circle (pi r2).