An infinite number of shapes.
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A concave is not a shape. It is a characteristic of one. It is like asking how many parallel lines a small has.
At least 4 lines, but no matter how many lines, every line has to be parallel with at least one other line.
one
2 parallel lines * * * * * The above answer is not wholly correct. A hexagon can have one, two or three pairs of parallel lines: a regular hexagon has 3 pairs.
2 parallel lines * * * * * The above answer is not wholly correct. A hexagon can have one, two or three pairs of parallel lines: a regular hexagon has 3 pairs.