Elements of analytical geometry and the differential and integral calculus (1856)
Robinson, Horatio N. (Horatio Nelson), 1806-1867 · Cincinnati : J. Ernst · leaf 133
B.—The only difficulty a learner can experience will arisefrom a want of the proper perception of the figure projected ona plane. Hence, teachers should construct the ^yo^qv pasteboardfigures, which will give the real and simple representation. Let PP=D be the line in question.Let the co-ordinates… … STRAIGHT LINES IN SPACE. 125 Scholium. If through one extremity of the line, as /*, wedraw PA to the origin, and from the other extremity P, wedraw PS parallel and equal to PA, and join AS, it will beparallel to PP, and equal to it, and this virtually reduces thisproposition to the previous one.…
Geometry, Analytic · Calculus
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