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The Octahedron and the Tetrahedron - Interestingys.
In geometry, they are considered duels. Octahedrons and tetrahedrons are complementary geometric shapes called duels because their edges and vertices are flipped. So interestingly, with the cube and the octahedron, they have the same number, but it's flipped. The reason is those eight triangles interesting all so interesting is that shape has the one square that i just talked about. It's actually deceiving because there are three different squares in thatOctahedron.