A tetrahedron has 4 vertices and 4 sides. Each side is an equilateral triangle.
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Each face is an equilateral triangle only if it is a regular tetrahedron; there is no reason to assume it is.
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A tetrahedron is a polyhedron that is made up of four triangular faces. It has 6 edges.
A tetrahedron is a shape that usually has four faces. 'Tetra' generally means four, meaning that it has four sides.
A tetrahedron is a pyramid with a triangular base. An example would be this kite: http://en.wikipedia.org/wiki/Tetrahedral_kite
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.
there are many different kinds and many different brands of hybrids
I don't know. How many friend do you have?
Clay consists of many different elements, and it is therefore impossible to tell how many electrons it has.