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A triangular based pyramid has no parallel lines but it does have 4 faces, 6 edges and 4 vertices.
A pyramid, being three-dimensional, does not have linesof symmetry.Your question should really be "How many planes of symmetry does a pyramid have?"This answer may vary, depending on your definition of symmetry. But normally the answer "Four" is accepted.
a scalene pyramid.
It meed not have any.