A regular tetrahedron (triangular pyramid).
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3d shape Well actually it is a Cube
A 3D shape with all triangular faces can be a tetrahedron pyramid.
There are several of these. For example, dice.See related link below for more shapes
a sphere
According to Euler none; for all 3d shapes: Vertices + Faces = Edges + 2 ⇒ 12 + 8 = 19 + 2 ⇒ 20 = 21 So unless 20 does equal 21, no 3d shape has 8 faces, 19 edges and 12 vertices. Any 3d shape with 8 faces would be an octahedron.