a finite right lineon any plane is equal to the line multiplied hy the cosiiie of theangle^ which it makes with the plane. Let P(7, PC be drawn perpendicular to the plane XOY\and CO is the orthogonal pro- .p jection of the line PP on that ^ plane. Complete the rectangleby drawing PQ parallel to… … * The angle a line makes with a plane is measured by the angle which the linemakes with its orthogonal projection on that plane. The angle between two planes is measured by the angle between the perpendicularsdrawn in each plane to their line of intersection at any point of it. It may also…
Geometry, Analytic · Surfaces
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