Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 131
nt«;r-scction with tl;e plane MXwill be PD ; in the plane .MXdraw BC |)erpendicular to PD, and draw AD. By the Corollary of the preceding Theorem, BC is perpen-dicular to the [)ldJie APDE ; therefore the angle lîDE is a rightangle; but the angle EDP is also a n<,dit angle, sinc(; AP… … 132 GEOMETRY.
Trigonometry · Geometry
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