Higbee, F. G · New York, John Wiley & Sons · leaf 92
tal). Lay off an angle of 60 degrees with its vertex o on sS PROBLEMS ON POINTS, LINES, AND PLANES 8l and one side OP perpendicular to sS. Pnop will be the revolvedposition of the given angle the ore body makes with H, and Phwill be the revolved position of the point where OP pierces V.Since the… … Fig. 64. 71. Special Case. Given the angles a plane makes with Hand V and the location of one point in the plane to find the tracesof the plane. Discussion. If through the given point a line be drawnperpendicular to the required plane this Hne will make with Hand V angles equal to the complements…
Geometry, Descriptive
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