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If you know the radius, then the diameter is 2R. If you know circumference, then the diameter is C/(pi). If you know the area, then the diameter is the square root of 4A/(pi).

R is the radius of a circle, C is the circumference and A is the area.

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

How to

www.onlineconversion.com/circlesolve.htm

Solve area,

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

Pi is the ratio of the circumference of a

www.mathgoodies.com/calculators/circumference-calculator.html

Our circumference

www.csgnetwork.com/picalc2.html

This

www.ck12.org/geometry/Diameter-or-Radius-of-a-Circle-Given-Circumference/lesson/Diameter-or-Radius-of-a-Circle-Given-Circumference/

Oct 29, 2012

www.ask.com/youtube?q=Calculate Diameter of Circle&v=mEqUcfDC5rM

Apr 6, 2011 ... A how to video on How To Determine The Diameter Of A Circle that will improve
your math skills. Learn how to get good at math from ...

www.ookingdom.com/metric/diameter

If JavaScript is not working on your browser, or in case you are simply curious,
here is the procedure for

www.calculatorsoup.com/calculators/geometry-plane/circle.php