A formula for this question is that the total measure of the interior angles of a polygon is 180 degrees multiplied by 2 less than the number of sides.
For a seven sided polygon, this formula yields 180 X 5 = 900 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.