Answer
- Starting with a Circle > duplicate it
- Menu Effect > Distort Transform > Zig-Zag
- Menu Object > Expand to get the new shape vector anchor points
- Add a Stroke to increase the gap difference with the original circle. This step is because the Star Shape is smaller than the original circle. Could be replaced by reducing a little the shape size proportionally to the center.
- Menu Object > Expand to get the stroke shape vector anchor points
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Menu Object > Ungroup
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Select the stroke and the shape > Pathfinder > Minus Front
- Center this shape with the original circle
- Select both shapes > Pathfinder > Intersect
Result
Attribution
Source : Link , Question Author : markzzz , Answer Author : Community