It is a triangular based pyramid
What polyhedron has eight sides and all of the are equilateral triangle?
that's easy its a triangle * * * * * That is such a nonsensical answer! A triangle is not even a polyhedron. The correct answer is an octahedron - two square based pyramids stuck together along their bases.
pentagon
octahedron
An octahedron.
tetrahedron
An eight-face polyhedron is called an octahedron.
octahedron
You're an octagon.
Octohedron, or rhomboid.
A regular octahedron.
Octahedron- A polyhedron with eight faces. All faces of a regular octahedron are congruent, equilateral triangles.