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One possible way: draw 21 radii, each forming an angle of 17.142857.. degrees with another radius.

Another option: the question does not require the 21 parts to be equal. So make twenty cuts where each cut divides a segment into two (equal or unequal) parts.

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Q: How do you divide circle into 21 parts?
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How do you divide a circle in 21 parts?

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