A heptagon has 7 sides
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No. First of all, it is a heptagon, not a hepatagon. And second, the sides need not be congruent.
The exterior angle of a n-gon is 360/n degrees. So for a heptagon, the exterior angle is 360/7 = 51.429 degrees.
10 sides.
There is no formula for how many sides there are in a polygon; the name of the polygon shows how many sides it has.
heptagons have 7 sides