Q: Platonic solid has eight faces that are equilateral triangles?

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Octahedron- A polyhedron with eight faces. All faces of a regular octahedron are congruent, equilateral triangles.

You're an octagon.

Their faces are equilateral triangles.

Equilateral triangles

equilateral triangles-Apex ;)

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tetrahedron

Assuming that "equal ladder" is meant to be equilateral, the answer is a tetrahedron, one of the 5 Platonic solids.

octahedron

it is afrog

Tetrahedron, Hexahedron(cube), Octahedron, Dodecahedron, and Icosahedron

Octahedron- A polyhedron with eight faces. All faces of a regular octahedron are congruent, equilateral triangles.

An octahedron.

tetrahedron

A solid with 8 faces is an octahedron.As all faces are the same it is a regular octahedron.As such it is one of the five platonic solids - the only five 3D objects that can be regular: the tetrahedron (4 equilateral triangles for the faces), the hexahedron (usually called a cube with 6 square faces), the octahedron (as asked, 8 equilateral triangles for the faces), dodecahedron (12 regular pentagons as faces), icosahedron (20 equilateral triangles as faces).

What polyhedron has eight sides and all of the are equilateral triangle?

In geometry, an octahedron (plural: octahedra) is a polyhedron with eight faces. A regular octahedron is a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex.It is a 3-dimensional cross polytope (shape).---Wikipedia

You're an octagon.