Q: What is the measure of an interior angle in a regular 20-gon?

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Each interior angle will measure 162 degrees

It is: 180-exterior angle = interior angle because there are 180 degrees on a straight line

Each interior angle of a regular 8 sided octagon measures 135 degrees

A regular trapezoid (!) is a square. And each interior angle of a square is 90 degrees.

120°

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Each interior angle will measure 162 degrees

The measure of each interior angle of a fifteen sided regular polygon, a pendedecagon, is 156o.

It is: 180-exterior angle = interior angle because there are 180 degrees on a straight line

144

120°

135 Each interior angle of a regular octagon measures 135 degrees.

Each interior angle of a regular 9 sided nonagon measures 140 degrees

Each interior angle of a regular 8 sided octagon measures 135 degrees

A regular trapezoid (!) is a square. And each interior angle of a square is 90 degrees.

A regular polygon having an interior angle measure of 168o has 30 sides and is called a triacontagon.

It will have 14 sides and each interior angle will measure 2160/14 degrees

Each interior angle measures 135 degrees