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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.

## How to Calculate the Diameter of a Circle (with Cheat Sheet)

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

How to Calculate the Diameter of a Circle. Calculating a circle's diameter is easy if you know any of the other dimensions of the circle: the radius, the ...

## Online Conversion - Circle Solver Calculator

www.onlineconversion.com/circlesolve.htm

Solve area, diameter, and circumference, circle equations.

## Circumference of a Circle - Math Goodies

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

Pi is the ratio of the circumference of a circle to its diameter ... Thus, the diameter of a circle is twice as long as the radius. ... 3.14 to calculate your answers.

## Circumference Calculator - Math Goodies

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

Our circumference calculator lets you find the circumference of a circle after you enter its radius. For in-depth instruction on the circumference of a circle, try our ...

## Diameter Calculator - CSGNetwork.Com

www.csgnetwork.com/picalc2.html

This calculator requires the use of Javascript enabled and capable browsers. PI is approximately 3.14, by definition, the number of times that a circle's diameter ...

## Diameter or Radius of a Circle Given Circumference ( Read ... - cK-12

Oct 29, 2012 ... The diameter is two times the radius, so the equation for the circumference of a circle using the radius is two times pi times the radius.