Snyder, Virgil, 1869-1950, Sisam, Charles Herschel, b. 1879 · New York : H. Holt and Company · leaf 19
ORDINATES [Chap. I. Theorem I. The length of the projection of a segment of adirected line on a second directed line is equal to the length of thegiven segment midtiplied by the cosine of the angle between the lines. Let PQ (Figs. 3 a, 3 b) be the given segment on I and let PQbe its projection on…
Geometry, Analytic
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