If you mean 21% of 360 then it is 75.6
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17 (17.1429) times.
The sum of the exterior angles of any polygon, regardless of the number of sides, is always 360 degrees. Therefore, the sum of the exterior angles of a 21-sided polygon is 360 degrees.
Each exterior angle is 360/21 = 17.1429 deg so each interior angle is 180 - exterior angle = 162.8571 degrees.
The total of all the exterior angles of a polygon with ANY number of sides is 360 degrees.
9 of 360 = 32409 of 360 = 32409 of 360 = 32409 of 360 = 3240