The answer is a polyhedron
A regular octahedron is one of the platonic solids. Each of its faces is an equilateral triangle.
Regular Tetrahedron
Yes. A tetrahedron is a closed 3-d shape with 4 triangular faces. In a regular polygon, each of these is an equilateral triangle.
An icosahedron is a regular polyhedron with 20 equilateral triangle faces.
The answer is a polyhedron
A regular octahedron is one of the platonic solids. Each of its faces is an equilateral triangle.
Regular Tetrahedron
Yes. A tetrahedron is a closed 3-d shape with 4 triangular faces. In a regular polygon, each of these is an equilateral triangle.
An icosahedron is a regular polyhedron with 20 equilateral triangle faces.
There is no such thing as a 3d triangle. A 3d shape which has only equilateral triangular faces can be a tetrahedron which has 4 faces or an icosahedron which has 20.
One face that is the equilateral triangle.One face that is the equilateral triangle.One face that is the equilateral triangle.One face that is the equilateral triangle.
octahedron
3
Octahedron.
Tetrahedron
It_is_a_triangular_prism.">It_is_a_triangular_prism.">It is a triangular prism.* * * * *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.