cube
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a cube * * * * * A cube is only one example. Any one of the five Platonic solids - tetrahedron, cube or hexahedron, octahedron, dodecahedron or icosahedron - are made up from congruent plane faces.
One: a tetrahedron is a single solid.
No. A right angle would be 90 degrees; a tetrahedron is composed of four equilateral triangles, which by definition have equal angles of 60 degrees apiece.* * * * *Wrong!A tetrahedron is a solid shape enclosed by any four triangles. Only a regular tetrahedron that requires equilateral triangles. So an ordinary tetrahedron can have right angles - up to 3 of them at one vertex.
A tetrahedron.
A four faced figure is a tetrahedron. If they are all congruent triangles, they are all equilateral triangles and it is a regular tetrahedron - one of the 5 Platonic Solids.