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A tetrahedron.
tetrahedron
No, a cone is not a tetrahedron. A cone is a three-dimensional geometric shape with a circular base and a pointed vertex. A tetrahedron, on the other hand, is a four-sided polyhedron with triangular faces.
A tetrahedron ABCD is isosceles if AB=BD, AC=BD, and AD=BC. In other words, in an isosceles tetrahedron the opposite edges are equal. See the related link for more information.
A tetrahedron is the smallest possible polyhedron: a closed 3-d shape with polygonal faces. It has 4 triangular faces, 4 vertices and 6 edges. It is also known as a triangle-based pyramid. Any other properties will generally depend on the particular tetrahedron.