there are two plane symmetry on triangular prism.
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.
3D shapes don't have lines of symmetry they have plane's of symmetry.
9 perpendicular lines
It could have just one - a plane (not plan!) parallel to its bases and halfway between them.
5
It has 2 lines of sym
there are two plane symmetry on triangular prism.
The question is too ambiguous because, depending on its orientation, the top of a triangular prism can be a triangualar face, a rectangular face or an edge.
A triangular prism has 9 parallel lines
2
It must have at least one.
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3
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