2 lines OF SYMMETRY
4 Lines of symmetry
There is no such thing as 8 lines of symmetry. A circle, for example, has infinitely many lines of symmetry.
It has 3 lines of symmetry
a cylinder has 29 lines of symmetry!
14
An octahedron has 7 perpendicular lines.
An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. Several of these may be considered as octahedron cone and the answer depends on which particular shape you have in mind.
It need not have any.
A nephroid has 2 lines of symmetry.
it has five lines of symmetry
2 lines OF SYMMETRY
10 lines of symmetry
4 Lines of symmetry
2 lines of symmetry
2 lines of symmetry
It has 2 lines of symmetry.