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The distance around the perimeter.

c=distance around

r=The radius of a circle is the length of the line from the center to any point on its edge

D= the distance across the circle
pi x diameter, or the equivalent 2 x pi x radius.

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12y ago
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16y ago

I have a circle that measures 42" in diameter. I have to put fabric around that at a 2.5 to 1 fullness. What is the flat piece of fabric I need

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12y ago

It is the distance around a circle and is found by 2*pi*radius or diameter*pi

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Q: What is circumference of a circle?
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