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How do I solve diameter of a circle

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Pie r square

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your textbook

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This questions in science and I didn't know I was gonna need my math book sooo ya
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Whatever your radius is, multiply by 2 (or double it). EX: radius= 2, diameter= 4.
Formula to find the area of a circle: PI r squared.

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Thank you that is very helpful(:
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It's the radius times 2. Example: If the radius of a circle is 4, then the diameter is 16.

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Check here: http://www.mathgoodies.com/lessons/vol2/circumference.html

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