A triangular based pyramid has no lines of symmetry. However, if each of the non-base triangular sides are equal it will have 3 planes of symmetry. If the base triangle is also equal, it will have 6 planes of symmetry.
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It has 1 set of 3 parallel lines and 3 sets of 2 parallel lines, and 18 angles (3 sides meet at each vertex)
Both!! gezz that's easy :P
a square based pyrmaid has 24 lines of symitry
A triangular based pyramid has no parallel lines but it does have 4 faces, 6 edges and 4 vertices.
None because a tetrahedron is a triangular based pyramid with 4 faces, 6 edges and 4 vertices
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A triangular prism has 9 parallel lines
Two pairs.
A triangular based pyramid has no lines of symmetry. However, if each of the non-base triangular sides are equal it will have 3 planes of symmetry. If the base triangle is also equal, it will have 6 planes of symmetry.
If you mean a square based pyramid then: there are 4 on the base, and 4 on the sides so there are 8 total.
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A triangular pyramid has three lines of symmetry. Each of these lines connects a vertex of the base to the midpoint of the opposite edge on the base.
They are the one dimensional "lines" where the faces of the pyramid meet, in pairs.
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