No, a heptagon cannot be parallel but two heptagons can.
A heptagon can be concave.
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If it were a perfect heptagon then it would be convex. If it had any indentations then it would be concave.
I think it is niether * * * * * A heptagon is simply a plane shape bounded by seven straight sides. Any polygon with three of more sides can be concave or convex.
No
You can have 0, 1, 2, or 3 pairs of parallel sides in a heptagon.
No, only 1 parallel line