If the seven sides are all the same length , then it is a regular polygon.
A seven sided polygon is named a 'HEPTAGON'.
If the seven sides are regular then it can be named as a ' Regular Heptagon'.
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A square is a regular four-sided polygon.
It is the sum of its 7 equal sides.
A 6 sided hexagon polygon can be regular or irregular.
A 7 sided polygon is called a Heptagon or a Septagon.
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.