An 11 sided polygon has interior angles that add up to 1620 degrees
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If its interior angles add up to 1620 degrees then it will have 11 sides
A hendecagon is a regular 11-sided polygon, the angles of which are all 147.27(recurring) degrees. With 11 sides there will be 11 angles, so 147.27 * 11 = 1620 degrees.
There is no such figure as a 20 degrees polygon.
If each interior angles is 179 degrees, then the polygon has 360 sides
The polygon has 16 sides :)