(pie)ve.
Truly, a circle has no straight sides.
If you draw a shape with enough straight sides, it will look like a circle if you don't look too closely, but it will never be a circle.
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None.
An ellipse.
An arc has no straight sides because its part of the circumference of a circle
A circle has no straight sides but if you mean a circle that has been divided into 5 equal sectors then the angle of each sector is 72 degrees subtended by each arc of the circle.
They are straight lines, part s of which form chords of the circle.