Elements of geometry and trigonometry. Revised and adapted to the course of mathematical instruction in the United States (1856)
Legendre, A. M. (Adrien Marie), 1752-1833, Davies, Charles, 1798-1876 · New York : A.S. Barnes · leaf 172
hedivided proportionally. Suppose the line xiB to meet the parallel planes MN,PQ, Its, at the points A, E, B; and the line CB to meetthe same planes at the points C, F, D: then AE : EB : : CI^Draw AD meeting the planePQ in G, and draw AC, EG, GF,BD. Since the parallel planes PQ,RS, are cut by the… … 168 GEOMETRY. PKOrOSITION XVI. TIIEOKEM. If a line is jyeriiendicular to a ijlane^ every plane passedthrough the i^erpendicular^ is also perpendicular io the 2^la7ie. Let AP be perpendicular to the plane KM; then Avillevery plane passing through AP be perpendicular to KJI. Let BF be any plane…
Geometry · Trigonometry
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