The interior angle of a heptagon (a 7-sided regular polygon), rounded to two decimal places, is equal to 180 - ((180 / 7) x 2) = 128.57 degrees.
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It is approximately 128.57
An irregular septagon: the right-angle will prevent it being regular.
Each interior angle of a regular 7 sided polygon is 128 degrees 34 minutes and 17.14 seconds
It's 900 degrees, and it doesn't matter whether the 7-sided polygon is regular or not.
Any 7-sided polygon will do that for you.