If it were a perfect heptagon then it would be convex. If it had any indentations then it would be concave.
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No, a heptagon cannot be parallel but two heptagons can.A heptagon can 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.
It depends entirely on their relative shapes and sizes. They could make a triangle, a parallelogram, a square, or a pentagon or even a concave heptagon.
None, because there is no such shape. There is a heptagon (7 sides) or an octagon (8 sides), and the answers will be different depending on what you meant. In their convex form, either can have at most 3 right angles. But a concave heptagon can have any number up to 6 right angles. A concave octagon can have up to 7 interior right angles. It can, in fact have all eight if reflex right angles (270 deg) are allowed.
heptagon