120.A regular Dodecahedron has 120 symmetries.
A
A dodecahedron need not have any parallel lines.
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As with the Roman alphabet, which you may be familiar with it (since you are using it to read this answer), different letters have different symmetries.
120.A regular Dodecahedron has 120 symmetries.
9 reflection
A
A dodecahedron need not have any parallel lines.
A regular hexagon has 6 rotational symmetries (rotational symmetry of order six) and 6 reflective symmetries (six lines of symmetry).
It need not have any.
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It need not have any.
It need not have any.
An equilateral triangle has six symmetries, and an isosceles triangle has two.
There are no lines of symmetry in a 3d figure.The right question is how planes of symmetry are there in a pentagonal pyramid.Then the correct answer is 5 planes of symmetry.
3