Woods, Frederick S. (Frederick Shenstone), 1864-, Bailey, Frederick H. (Frederick Harold), 1865- · Boston, New York [etc.] Ginn and Company · leaf 20
thedirection NM (fig. 5). Denote the angle between MN and AB by </>, and draw ACparallel to MN. Then in both cases, by trigonometry, AC = AB cos<f>. But AC = AB, and therefore AB=AB cos (f>. Hence, to find the projection of one straight line upon a second,multijrty the length of the… … NUMBER SCALE 3 Let ABODE (fig. 6) be a broken line, MX a straight linein the same plane, and AE the straight line joining the endsof the broken line. Draw AA, BB, CO, DD, andEE perpendicular to MN; thenAB, BC, CD, DE, tm&AEare the respective projections onJAY of AB, BC, CD, DE, and JA. But, by…
Geometry, Analytic · Calculus
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