The figure described is a polyhedron. It is a tetrahedron known as a triangular pyramid.
Chat with our AI personalities
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.