That object would be called a triangular pyramid, also known as a tetrahedron.
A three dimensional triangular figure with three faces and a base is called a triangular pyramid. It has four vertices, four faces, and six edges.
The given description fits that of a triangular based pyramid which has 4 faces, 6 edges and 4 vertices
A triangular prism, a triangle base and three triangular faces (a tetrahedron)The figures below do not strictly have a "base" but they are composed entirely of trianglesAn octohedron (eight sides)An isocahedron (20 identical equilateral triangular faces, 30 edges and 12 vertices)Any of a number of deformations of the above
A rectangular pyramid has 5 faces: a rectangular base, and 4 triangular faces.
8 lateral faces and a base
A tetrahedron.
A triangular prism has two triangular bases and three lateral rectangular faces. It has five faces in all so that it is a pentahedron.A triangular pyramid has a triangular base and three triangular lateral faces. It has 4 faces in all so that it is a tetrahedron.
It is a 3D shape comprising a triangular base and three triangular lateral faces rising from its edges to meet at an apex above the base.
A pyramid.
A pyramid
The description given could fit that of a pyramid
It is a pentahedron with a rectangular base and four triangular lateral faces.
3. You wanna know how?? First there are 3 triangles that touch the base, so there are only 3 lateral faces. :)
A three sided pyramid.
Tetrahedron.
no, it's a pyramid
Triangular Pyramid