Woods, Frederick S. (Frederick Shenstone), 1864-, Bailey, Frederick H. (Frederick Harold), 1865- · Boston, New York [etc.] Ginn and Company · leaf 19
veAB + BC = AC, where AC=~ CA by (2). It is evident that this addition is analogous to algebraicaddition, and that this sum may be an arithmetical difference. From (1) we may obtain bytransposition a formula for sub- C A b traction ; namely, Fig. 3 BC = AC-AB. (3) This is universally true, since… … perpendicular to MN, intersecting it at points A and B respec-tively. Then AB1 is the projection of AB on MN, and is positiveif it has the direction MN (fig. 4), and negative if it has thedirection NM (fig. 5). Denote the angle between MN and AB by </>, and draw ACparallel to MN. Then in both…
Geometry, Analytic · Calculus
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