2
It must have at least one.
A trapezium prism has 10 vertices
None, normally. One if it is an isosceles trapezium.
7
This depends on the type of prism. If the shapes on the ends are pentagons, the prism has 6 planes of symmetry. If they are hexagons, it has 13 planes of symmetry. It has the same number of planes of symmetry as the shapes on the end have lines of symmetry, plus 1.
there are two plane symmetry on triangular prism.
3
2
Three.
The answer is 13- for more detail:
Three.
3D shapes don't have lines of symmetry they have plane's of symmetry.
five
It must have at least one.
A trapezium prism has 10 vertices
A trapezium can have at most 1 line of symmetry.