Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 130
ular to the line of the plane. Let AP be perpendicular to theplane NM, and PD perpendicular to]^C ; then will AD be also perpen-dicular to BC. Take DB = DC. and draw PB, PC,AB, AC. eince DB=rDC, the ob-lique line PB=:PC: and with regardto the perpendicular AP, since PB =PC, the oblique line AB==AC… … Ei BOOK VI. 131 Cor. It is evident likewise, that BC is perpendicular to theplane API), since BC is at once perpendicular to the twostraight lines AD, PD. Scholium. The two lines AE, BC, afford an instance of twolines which do not meet, because they are not situated in thesame |)!aiic. The shortest…
Trigonometry · Geometry
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