Technically, false, because an included angle does not depend on the length of the sides except in right triangles, where the sides will have the same relationship for either of the two acute angles.
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When measuring an angle you have to measure the sides using a protractor.
A regular polygon with each interior angle measuring 120 degrees is a hexagon.
The length of the sides has nothing to do with the measure of the angle.
Interior angle 162 Exterior angle 18 It will have 20 sides
360/1 = 360 sides