No.
First of all, it is a heptagon, not a hepatagon. And second, the sides need not be congruent.
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A heptagon has 7 sides
No. If you made a parallelogram with congruent sides it wouldn't necessarily have congruent angles. A square has to have congruent angles as well as congruent sides.
It all depends on what kind of polygon it is. It may have no congruent sides or all congruent sides.
They are sometime congruent because a square is a parallelogram and its sides are congruent and a rectangle is one and its sides aren't congruent.
No. The word congruent is not applied to sides or angles.