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The measure of one interior angle of a regular polygon with 20 sides is 162°.
The general rule to find the measure of the interior angle of a polygon with n sides is:
( n - 2 ) * 180° / n
In the case of our 20-gon, n equals 20, so...
( 20 - 2 ) * 180° / 20
18 * 180° / 20
3240° / 20
162°
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