ince OD = a, OE=h, Oi^=c, the point given bythe equations x = a, y = l>, z-=c may be found by the follow-ing symmetrical construction: measure on the axis of x, thelength 0Z>= a, and through D draw the plane PBCD parallelto the plane yz: measure on the axis of y, OJE= b, and throughE draw the… … THE POINT. 3. The points A^ B^ (7, are called the projections of thepoint P on the three coordinate planes; and when the axes arerectangular they are its orthogonal projections. In what fol-lows we shall be almost exclusively concerned with orthogonalprojections, and therefore when we speak simply…
Geometry, Analytic · Surfaces
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