The book Elements of Synthetic Solid Geometry was written by author N F Nathan Fellowes Dupuis Here you can read free online of Elements of Synthetic Solid Geometry book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Elements of Synthetic Solid Geometry a good or bad book?
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AA', BB 1, etc. , are the diagonals of a ppd. Show that a plane through DBC' cuts off a pyramid which is one-sixth the ppd. 12. The direction edges of a ppd. Are a, b, c, and the angles between them are Z (be) = X, Z (ca) = /u, Z (aft) v. Then the vol. Is abc Y/ { 1 cos 2 X cos 2 /j. Cos 2 v + 2 cos X cos p cos v}. OA, OB, OC are the direction edges; Z COB = X, Z COA = M, ZAOB = v. Let CP be normal to the plane of A OB, and PQ, PE be J_s upon OA and OB. vol. Of ppd. = OA- OB sin v CP. (P. Art. ...215. ) ot OQPR are concyclic, and OP is a diameter of the circumcircle ; (P. Art. 228. ) and But and CT=V(L~ \ sin 2 v) sm v ' vol. = ab -v/( c2 s i n2 * ~ QR 2 )- QR 2 = OO, 2 + OR 2 - '20Q OR cos v ; OQ 2 = c 2 cos 2 fi, and O. R 2 = c 2 cos 2 X. REGULAR POLYHEDKA. 123 Whence, by substitution, vol. = abc - x /{ 1 cos 2 X cos 2 fj. Cos 2 v + 2 cos X cos p cos v}. 1 13. Show from the character of the result in Ex. 12 that if in fcny ppd. X, /*, v are all acute, all vertices except the one opposite have one acute and two obtuse angles, etc.
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