The polygon with 128.57° as every interior angle is a septagon.
If the interior angle = 128. 57°
Using ( n-2) × 180 = sum of interior angles
Let's say n= 7
We have that,
(7-2) × 180 = 900
Let's find out the polygon
= 7 × 128.57
= 900
A polygon with seven sides is a septagon
Thus, the polygon with 128.57° as every interior angle is a septagon.
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