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Area of a circle - Wikipedia

en.wikipedia.org/wiki/Area_of_a_circle

In geometry, the area enclosed by a circle of radius r is πr<sup>2</sup>. Here the Greek letter π represents a constant, approximately equal to 3.14159, which is equal to the r...

Area of a Circle - Math Goodies

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

Area of a circle is presented in this interactive lesson from Math Goodies. ... In the last lesson, we learned that the formula for circumference of a circle is: C ...

Area of a circle | Area | Geometry foundations | High school ...

www.khanacademy.org/math/geometry/hs-geo-foundations/hs-geo-area/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.

How to Calculate the Area of a Circle (with Examples) - wikiHow

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

You will also learn how to find the area of a sector, which is a slice of a circle, similar in shape to a slice of pie or ... The formula for finding the area of a circle is

What is the Formula for the Area of a Circle? | Virtual Nerd

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

Did you know that you can figure out the formula for the area of a circle by first turning the circle into a parallelogram? It seems a little weird, but it really works!

The Circle Area Formula

britton.disted.camosun.bc.ca/pi/circlearea/circlearea.html

A circle's area is found using the formula: ... up a circle into little pieces, and then reassemble it into a shape that we know the area formula for ... the rectangle.

Area of Sectors and Segments of Circles - Regents Exam Prep Center

www.regentsprep.org/regents/math/geometry/gp16/circlesectors.htm

Let's review what we know about the area of circles and sectors. ... The second formula can be algebraically reduced, but it is easier to remember that you are ...

Circle Circumference, Circle Area, Sphere Area, Sphere Volume ...

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, ...

Area of a Circle | Formula for Area of a Circle | Math@TutorVista.com

math.tutorvista.com/geometry/area-of-circle.html

Area of a circle can be found easily with the help of the area of a circle formula if the radius or diameter (twice of radius) of the circle is given. In this article, we ...

Areas, Volumes, Surface Areas - Math

math2.org/math/geometry/areasvols.htm

circle = pi r <sup>2</sup>. ellipse = pi r1 r2 ... [s(s-a)(s-b)(s-c)] when s = (a+b+c)/2 (Heron's formula). regular polygon ... (total area) = perimeter(b) L + 2b. sphere = 4 [pi] r<sup>2</sup>.

Answer
The formula for finding the area of a circle is A=(pi)R^2.
R is the radius of the circle.
More Info

Area of circle, formula and illustrated lesson: how to calculate the ...

www.mathwarehouse.com

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

Area of a Circle - Math is Fun

www.mathsisfun.com

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":.

How Do You Find the Area of a Circle if You Know the Diameter ...

www.virtualnerd.com

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.