A triangular pyramid, also known as a tetrahedron, has four faces. This three-dimensional geometric shape is made up of four triangular bases.
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a 4 sided 3d shape is called a triangular prism!!!!!!!!!!!!!!!
Tetrahedron
Triangular Pyramid.
3d shapes with plane faces are called polyhedra (singular = polyhedron). The minimum number of vertices is 4, there is no maximum.
It is important to learn and remember the name of 3D shapes. A 19 faced 3d shape is called a nonadecahedron.