It depends on the base. If the base is an n-sided regular polygon, the pyramid will have n/2 pairs of parallel sides.
The number of parallel sides when the base is irregular will depend on the exact details of the base.
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None.
None. A triangle based pyramid is a 4-sided solid (a tetrahedron), and has no parallel sides.
2 pairs of parllel sides
The base of a square pyramid is a square and its edges are parallel. The sides are not parallel since they intersect at the apex.
Yes, there are two pairs of parallel sides.