You can't. However, you can divide it into seven, like so:
Make the lines make a triangle in the middle of the circle, rather than making them meet at the centre.
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A circle is 380 degrees Therefore: 380 / 13 = 29.230769231
There's an infinite number of lines of symmetry in a circle.
Infinite amount of times. Its just a matter of how accurate you can draw the dividing lines.
A circles has no perpendicular lines. Perpendicular lines are two straight lines that join forming 90 degree angles. They are found in squares, rectangles, and right-angled triangles. A circle is made by one line that is not straight but is curved. If you drew a circle, rectangle, right-angled triangle, or cross in the circle, then the circle would contain perpendicular lines. But the circle itself would have no perpendicular lines.
A Circle has an infinite number of lines of symmetry.