Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 120
s of H withQ and R are parallel, H must beparallel to the line of intersection,A, of these planes. Hence Ahpasses through th and parallel toHQ and IIR, while A passes through t and is parallel to GL.The line of intersection is thus seen to be a horizontal principalline (§ 99) of each of the given… … Fig. Ifi8. 100 DESCRIPTIVE GEOMETRY [XII, § 118 Q. I Ha VR \ Ah uh \ \ If both the H- and F-traces of the given planes are respec-tively parallel, the planes are parallel (§ 103), except in thecase in which each plane is parallel to the ground line. Special Case II. Suppose that both planes are…
Geometry, Descriptive
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