Snyder, Virgil, 1869-1950, Sisam, Charles Herschel, 1879-, Hill, Theodore Preston. Early American mathematics books. CU-BANC · New York, H. Holt and Company · leaf 23
ight line. COORDINATES [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 multiplied by the cosine of the angle betiveen the lines. Let PQ (Figs. 3 a, 36) be the given segment on I and let PQbe its… … FIG. 3 a.
Geometry, Analytic
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