the projections of the point P on the threeaxes. The projection of a finite right line upon another right lineis equal to the first line multiplied hy the cosine of the anglebetween the lines. Let FP be the given line, and DD its projection on OX.Through P draw PQ parallel toOX to meet the plane P… … 6. If there he any three points P, P, P, the projection ofPF on any line will he equal to the sum of the projections onthat line of PP and PF\ Let the projections of the three points be i), D\ B\ thenif U lie between D and U\ BD is evidently the sum of DU angle between PP and CC, we should draw the…
Geometry, Analytic · Surfaces
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