rectangular axes aredifferent. 39. Let P, Q be two points on a straight line, andthrough P, Q draw planes parallel to the co-ordinate planesso as to form a parallelepiped, and let PL, LK, KQ beedges parallel to the axes. Then the ratios of PL, LK, KQto PQ are called the direction-ratios of the line… … Let \, fjb, V be the angles YOZ, ZOX, XOY respectively.Let I, m, n be the direction-ratios of the line PQ, and leta, yS, 7 be the angles it makes with the axes. Let PZ, XiT,KQ be parallel to the axes so that PL = I. PQ, LK = m. PQ,KQ = n.PQ, as in Art. 39. Then, since the projection ofP^ on the…
Geometry, Analytic -- Solid
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