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None. A triangle based pyramid is a 4-sided solid (a tetrahedron), and has no parallel sides.
Depends if it's a square based Pyramid or a Triangular based Pyramid. Square based has 5 sides, Triangular based has 4 sides. Hope I could help!
A triangular based pyramid has 4 sides. 3 triangle sides and 1 Square base
Triangular based Pyramid
In a triangular based pyramid, the three faces that form the base are perpendicular to the apex of the pyramid, which means they have pairs of perpendicular sides. The other three faces, which are triangular, do not have pairs of perpendicular sides.