An ellipse.
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(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.
A rhombus
None.
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.