Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 132
132 GEOMETRY. … Co?\ i. Conversely, if thestraight hnes AP, DE, areperpendicular to the sameplane MN, they will be par-allel ; for if they be not so,draw through the point D. aline parallel to AP, this par-allel will be perpendicularto the plane MN ; thereforethrough the same point D more than one perpendicular…
Trigonometry · Geometry
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