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While a triangular prism can have equilateral triangle faces, it has more faces that are quadrilateral (or rectangular).
A polyhedron with only equilateral triangular faces could be a tetrahedron, an octahedron in the form of a square based dipyramid, or an icosahedron.
The answer is a polyhedron
Tetrahedron
A regular polyhedron has equal size faces as in the case of a tetrahedron which is a triangular base pyramid that has 4 equilateral triangle faces.
An icosahedron is a regular polyhedron with 20 equilateral triangle faces.
octahedron
The answer is a polyhedron
Octahedron.
Tetrahedron
What polyhedron has eight sides and all of the are equilateral triangle?
It is a triangular based pyramid
Tetrahedron - a pyramid with a triangular base.
A regular polyhedron has equal size faces as in the case of a tetrahedron which is a triangular base pyramid that has 4 equilateral triangle faces.
An icosahedron is a regular polyhedron with 20 equilateral triangle faces.
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.
A 20-sided polyhedron is called an icosahedron. It has 20 equilateral triangle faces, 30 edges, and 12 vertices. It is a regular convex polyhedron with rotational symmetry.
pentagon
octahedron