4
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.
4
A triangle couldn't.
None - each of the faces (including the bas) is a triangle - triangles do not have any parallel lines.
no, the three sides converge at the top. and the bottom does not have an opposite side. Pyramids can be constructed on a square/rectangle base or a triangle base. Faces are parallel or otherwise accordingly
Triangle
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.
This is an impossible shape. The only 3-d shape with 4 plane faces is a tetrahedron (triangular pyramid). While its base is a triangle, all of its other faces are also triangles and so cannot have parallel sides.
A cube has three pairs of parallel faces and all faces are congruent.
A triangular based pyramid has no parallel lines but it does have 4 faces, 6 edges and 4 vertices.
A dodecahedron has 0 parallel faces