Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 136
AB to meetthe parallel planes MN, PQ,RS, at the points A, E, B ; andthe line CD to meet the sameplanes at the points C, F, D :we are now to show thatAE : EB : : CF : FD.Draw AD meeting the planePQ in G, and draw AC, EG,GF, BD ; the intersections EG,BD, of the parallel planes PQ,RS, by the plane… … PROPOSITION XVI. THEOREM. If a line is perpendicular to a pla7ie, every plane passed throughthe perpendicular, will also be pe?pendiculai to the plane. BOOK XL 137 Let AP be perpendicular to theplane NM ; tlien will every planepassing througli AP be perpendicu-lar to i\M. Let BC be the intersection…
Trigonometry · Geometry
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