I think about 48.
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In theory, an infinite number of times. In practice, it depends on the size of the circle, the precision of your instruments and your dexterity.
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To divide a circle into thirteenths, divide it into thirteen equal portions, or pieces.
divide
circle is 2d so, just fold it 15!
You divide 360 degrees by eight (there are 360 degrees in a circle) so each section would be 45 degrees.
A radius squared fits pi times into a circle (The area of a circle divided by pi is the radius squared).