No.
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None - each of the faces (including the bas) is a triangle - triangles do not have any parallel lines.
None. A triangle based pyramid is a 4-sided solid (a tetrahedron), and has no parallel sides.
There are no parallel lines in a triangle.
If you mean "triangle", a triangle can never have two parallel sides.If you mean "triangle", a triangle can never have two parallel sides.If you mean "triangle", a triangle can never have two parallel sides.If you mean "triangle", a triangle can never have two parallel sides.