Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 132
SITION VIII. THEOREM. If a straight Une is parallel to a straight line drawn in a plane,it will he. parallel to that plane. Let AB be parallel to CDof the plane NM ; then willit be parallel to the planeNM. For, if the line AB, whichlies in the plane ABDC,could meet the plane MN,this could only be… … PROPOSITION IX. THEOREM. Two planes which are perpendicular to the same straight line,are parallel to each other. BOOK VI. 133 O Let the planes NM, QP, be per- ^l pendicular to the line AB, then willihf • be parallel. ror, it they can meet any where,let O be one of their commonpoints, and draw OA,…
Trigonometry · Geometry
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