Q: What is the measure of an interior angle of a 18-gon?

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It is: 180-exterior angle = interior angle

Each interior angle will measure 156 degrees

Each interior angle will measure 162 degrees

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

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

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The measure of the exterior angle.

It is: 180-exterior angle = interior angle

Each interior angle will measure 156 degrees

Each interior angle will measure 162 degrees

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

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

Exterior angle+interior angle=180 degrees and 180-exterior angle=interior angle

With a protractor or if you know the exterior angle then it's 180 - exterior angle = interior angle

No. The sum of the other two interior angles.

Each interior angle measures 108 degrees

Any angle that you like.

by subtracting the interior angle from 360