A seven sided polygon is a heptagon. The fact that it is regular means that all its sides are of the same length. All its angles are of the same measure = 128.57 or 128 4/7 degrees.
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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'.
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 regular seven-sided polygon is called a heptagon.