Question

how many sides does a regular polygon have if each interior angle measures 180∞

Answer 1

INTERIOR ANGLE  = 180 DEGREES.

EXTERIOR ANGLE = 0

there fore , no. of sides =0

IT IS NOT A POLYGON.

INSTEAD IT IS JUST A STRAIGHT LINE.

Answer 2

interior angle--->180
if a polygon has interior angle of 180 then it's a straigt line hence it's not any polygon...
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