A 3D shape with all triangular faces can be a tetrahedron pyramid.
A triangle based pyramid.
A triangular pyramid has.
no simiar triangle are the same shape but not the same siz and conguant triangles are same shape and size
A regular octahedron.
Octohedron, or rhomboid.
You're an octagon.
Icosahedron are a shape with 20 faces, 30 edges and 12 vertices. All the faces are triangles.