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The interior angles of an n-sided polygon add to (n-2)*180 degrees.

So the interior angles of a 20-gon add to 18*180 = 3240 degrees.

The 20-gon is regular so each angle is a 20th of this ie 3240/20 = 162 deg.

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Q: What is the measure of an angle of a regular 20-sided polygon?
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