Higbee, F. G · New York, John Wiley & Sons · leaf 85
ssion. The angle a line makes with a plane is equal tothe angle a line makes with its projection on that plane. If,therefore, the given line be projected on the given plane and thetrue size of the angle between the given line and the projectionon the given plane be measured it will be the required… … Fig. S9- Article 56, find where the center line NQ pierces the plane S.This point is M, and it is the vertex of the required angle. Fromany other point N of NQ draw a Hne perpendicular to the plane PROBLEMS ON POINTS, LINES, AND PLANES 75 S and find where it pierces the plane S. This point is…
Geometry, Descriptive
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