Subjects for Mathematical Essays

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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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