Higbee, F. G · New York, John Wiley & Sons · leaf 84
Fig. s7. PROBLEMS ON POINTS, LINES, AND PLANES 73 mn and mn. Now at O, where PQ and MN intersect, erect aperpendicular to the plane R. This perpendicular intersectsAB at C. CO then is the center line of the shortest timber thatcan connect PQ and AB. Its true length may be found asin Article 38. … Fig. 58. 63. Proposition 14. Given the plan and elevation of a Imeto find the true size of the angle it makes with a given plane. Discussion. 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…
Geometry, Descriptive
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