Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 28
inate is positive;in Quadrant III, the abscissa is negative, the ordinate is negative;in Quadrant IV, the abscissa is positive, the ordinate is negative. SECTION XX ANGLES OF ANY MAGNITUDE If the line OP (Figs. 27-30) is revolved about 0 from OXas its initial position counter-clockwise, as shown by… … Fig. 27 Fig. 28 Fig. 29 Fig. 30 Angles between 0° and 90° are angles of Quadrant I.Angles between 90° and 180° are angles of Quadrant II.Angles between 180° and 270° are angles of Quadrant III.Angles between 270° and 360° are angles of Quadrant IV.
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