Perplexing Polyhedron
Can you picture a solid pyramid consisting of a square base and four equilateral triangles, alongside a solid tetrahedron with four faces identical to those of the pyramid's triangles? Now glue one triangle face of the pyramid to a triangle on the tetrahedron. How many faces does the resultant polyhedron have? It's not seven! (One of Martin Gardner's puzzles)
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Ramani AswathThe answer can be seen here:
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