A concave is not a shape. It is a characteristic of one. It is like asking how many parallel lines a small has.
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No, a heptagon cannot be parallel but two heptagons can.A heptagon can be concave.
A square has 2 pairs of opposite parallel lines.
There cannot be parallel lines in any [plane] triangles.
A triangular prism has 9 parallel lines
there are 2 sets of parallel lines in a square