At last count it was exactly 20!
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A sectagon is not a shape. I think you mean SEPTagon, which is a seven-sided polygon. It may or may not be regular. A regular polygon has all sides congruent and all angles congruent.
a regular hexagon... it has to be regular to have the 6 sides congruent.
Any odd sided regular polygon, ie an equilateral triangle, a regular pentagon, a regular heptagon, ...
Hexagon
It is a regular 5 sided pentagon
a regular polygon
A regular 12 sided dodecagon polygon
It is a regular octagon.
It is a regular 12 sided dodecagon
It is a regular 8 sided octagon.
A regular hexagon
if it has all congruent sides, then it is regular