Question

what is the other name of a tetrahedron?

a) Triangular pyramid
b) Triangular prism
c) Square pyramid
d) None of these ​

Answer 1

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a) Triangular pyramid

Answer 2

The tetrahedron is one kind of pyramid, which is a polyhedron with a flat polygon base and triangular faces connecting the base to a common point. In the case of a tetrahedron the base is a triangle (any of the four faces can be considered the base), so a tetrahedron is also known as a "triangular pyramid".