Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 302
line makes equal angles with the co-ordinate axes. Show, cos a = cos /3 = cos 7 = ■—— •V3 19. Find the polar co-ordinates of the point (2, 3, 6). 20. Prove by co-ordinates that the lines joining the mid-points of theopposite sides of any quadrilateral pass through a common point and arebisected by… … Fig. 158. of OP are a, fi, y, and its co-ordinates [OR, RQ, QP], x, j/, and ^.Then, the projection of OP on ON = projection of ORQP onON. But ON is the projection of OP on ON since ON is± to plane. .. X cos a -\- y cos p + z cos y =^ is the required equation of the plane. Discussion. — (1) If the…
Geometry, Analytic
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