Six triangles.
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6 Triangles!!
An actual star (that is, one that is in space), doesn't really have any corners since it's a big ball of gas. If you mean the traditional star shape, they generally have 5 points. There are such things as 4 pointed stars. The Star of David, a traditional Jewish symbol, has 6 points.
Five. They are:Tetrahedron (4 triangles)Cube (6 squares)Octahedron (8 triangles)Dodecahedron (12 pentagons)Icosahedron (20 triangles).
There are 48 triangles that can be formed because 6 triangles can be formed usin each point multiplied by 8.
The number of triangles in a complete graph with n nodes is n*(n-1)*(n-2) / 6.