The minimum interior angles of a polygon add up to 180 degrees which would give each interior angle of an equilateral triangle 60 degrees
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If it's a regular polygon then each interior angle measures 120 degrees.
No.
The only regular polygon with an interior angle of 90 degrees is the square, which has four sides. Other polygons can have an interior angle of 90 degrees, but they would not be regular polygons.
Each interior angle will measure 162 degrees
A regular polygon with each interior angle measuring 120 degrees is a hexagon.