Higbee, F. G · New York, John Wiley & Sons · leaf 76
n of two planes which are parallel tothe G. L. 56. Proposition 9. Given a plan and elevation of a line tofind where it pierces a given plane. PROBLEMS ON POINTS, LINES, AND PLANES 65 Discussion. If any plane be passed through the given hne itwill contain all points of that hne. It will, therefore,… … Fig. 54. common to it and the given line be located it will be the requiredpiercing point. Construction. In Fig. 54 is shown the plan and elevation ofa timber whose center line is OP. The problem is to find thepoint where this Hne OP pierces the plane tTt. Pass the auxil- 66 ESSENTIALS OF…
Geometry, Descriptive
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