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Mathematics 8 Online
OpenStudy (anonymous):

find the number of edges and the number of vertices of a regular polyhedron whose number of faces,each of which a triangle, is 20

OpenStudy (anonymous):

Your polyhedron is a platonic one http://en.wikipedia.org/wiki/Platonic_solid Since it has 20 faces it is an icosahedron with 20 triangular faces, 30 edges and 12 vertices See http://en.wikipedia.org/wiki/Icosahedron

OpenStudy (anonymous):

okay tnx

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