The book Subjects for Mathematical Essays was written by author Davison Charles Here you can read free online of Subjects for Mathematical Essays book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Subjects for Mathematical Essays a good or bad book?
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7. Prove that the sum of all the plane angles of the faces of a polyhedron with V vertices is 4F-8 right angles or double the sum of the interior angles of a convex polygon with the same number of vertices. 8. A polyhedron with F faces has all its faces triangular ; prove that the number of vertices is |(i^ + 4). If i^ = 10, prove that there is at least one vertex in which more than four faces meet. 59. THE TETRAHEDRON AND ITS CIRCUMSCRIBING PARALLELEPIPED. 1. Through two non-planar lines, one,... and only one, pair of parallel planes can be drawn. 2. Defining each pair of edges of a tetrahedon which do not meet as opposite edges, show that the three pairs of parallel planes drawn through opposite edges form a parallelepiped, and that each edge of the tetrahedron is a diagonal of a face of the parallelepiped. SUBJECTS FOR MATHEMATICAL ESSAYS 63 3. If two opposite edges of a tetrahedron be equal, the corresponding faces of the circumscribing parallelepiped are rectangles ; and, if two opposite edges of a tetrahedron be at right angles, the corresponding faces of the parallelepiped are rhombuses.
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