A three-dimensional shape with eight triangular faces is called an octahedron.
A cube.
a hexahedron with four rectangular sides and two square ends.
Octahedron. (i assume your talking about something three dimensional).
Sides and faces are the same thing, and an octahedron has eight.
A square pyramid has a base with 4 equal sides and triangular faces.
What polyhedron has eight sides and all of the are equilateral triangle?
An octagon
If, by "sides" you mean faces, then the answer is a pentahedron.
A regular 8 sided octagon has eight equal sides.
Octahedron- A polyhedron with eight faces. All faces of a regular octahedron are congruent, equilateral triangles.
An octahedron has eight faces - by definition.