Woods, Frederick S. (Frederick Shenstone), 1864-, Bailey, Frederick H. (Frederick Harold), 1865- · Boston, New York [etc.] Ginn and Company · leaf 61
to bechanged, the processes may evidently be performed successively,preferably in this order: (1) change of origin; (2) change ofdirection. 20. Oblique coordinates. Up to the present time we havealways constructed the coordinate axes at right angles to eachother. This is not necessary, however, and… … We now define x for any point in the plane as the distancefrom OF to the point, measured parallel to OX, and y as thedistance from OX to the point, measured parallel to OY. Thealgebraic signs are determined accord-ing to the rules adopted in § 4. It is immediately evident that therectangular…
Geometry, Analytic · Calculus
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