WHAT IS A TETRAHENDRON?

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In geometry, a tetrahedron (plural: tetrahedra) is a polyhedron composed of four triangular faces, three of which meet at each vertex. It has six edges and four vertices. The tetrahedron is the only convex polyhedron that has four faces.

a solid that has 4 equilateral triangles is called tetrahedron.

equilateral or congruent

all 3d shapes that hat equilateral triangle or in oyher words a triangular pyramid

i do not know

 a tetrahedron is a 3d shape which consists of four triangular faces, three of which meet at each vertex. It has six edges and four vertices. The tetrahedron is the only convex polyhedron that has four faces.

A shape which has triangle as the base

A Triangular pyramid is also called a tetrahedron.

a tetra hendron is a triangular pyramid. some examples are like the cover of the drink fruti

pagals

i don't know.