A concave is not a shape. It is a characteristic of one. It is like asking how many parallel lines a small has.
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
There can be no convex polygon with three parallel sides. There are concave polygons with 6 or more sides that have three parallel lines.
A triangle can have no parallel lines.
No, a heptagon cannot be parallel but two heptagons can.A heptagon can be concave.
A pentagon has no parallel lines.
it has too parallel lines!
A cone does not have any parallel lines
how many sets of parallel lines are in a triangle
A square has 2 pairs of opposite parallel lines.
Angles cannot be parallel.
A cube has exactly 6 parallel lines.
A cube has exactly 6 parallel lines.
2 pairs of parallel lines