A tetrahedron (triangular pyramid).
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A TETRAHEDRON has four congruent triangular faces four vertices six edges. "Tetra" means "four" in Greek "Hedron" means "sided"
Triangular pyramid.
Tetrahedron
A triangular prism has nine edges and six vertices.
One, two, three, four, five, six, seven, eight. The four edges on the base and the four vertices.