# How to Work Out the Diameter of a Circle?

To calculate the diameter of a circle, you will have to multiply the radius by two. The diameter can be defined as the distance across a circle through the centre or the line that touches two ends of circle and the centre.
Ask.com Answer for: how to work out the diameter of a circle
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.
Q&A Related to "How to Work Out the Diameter of a Circle"
 You can find the diameter of a circle by dividing the circumference by the number pi. You can also double the radius or find the side of a square the touches the circle in exactly http://answers.ask.com/Science/Other/how_to_find_d...
 The diameter of a circle is the measurement across the circle. The most important stipulation here is that the measurement taken must pass through the center of the circle in order http://answers.ask.com/Science/Mathematics/what_is...
 1. Measure from one side of the circle directly across to the other side, through the circle's center. If the circle is drawn to scale, this measurement will be the diameter. 2. Multiply http://www.ehow.com/how_6011124_calculate-diameter...
 1. Halve the diameter to find the radius. For example, if you want a circle with a diameter of 4 inches, take half of 4, or 2 inches. 2. Draw a line that is the length of the radius http://www.ehow.com/how_8628645_create-circles-dia...
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