4
It meed not have any.
One. Vertical through the apex.
A triangular-based pyramid, also known as a tetrahedron, has six lines of symmetry. Each line of symmetry can be drawn from a vertex of the triangular base to the opposite face, as well as along the medians of the triangular base. This symmetry reflects the pyramid's regularity and equal edge lengths in a regular tetrahedron.
a scalene pyramid.
A nephroid has 2 lines of symmetry.
4
It meed not have any.
7
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.
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.
One. Vertical through the apex.
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.
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.
7
a scalene pyramid.
a square based pyrmaid has 24 lines of symitry
A nephroid has 2 lines of symmetry.