Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 113
not be perpendicular to the second line ; for in thiscase the line would project as a point, and a point cannot besaid to be perpendicular to a line. Let the line A, Fig. 155, be parallel to H. Let Q be a planeperpendicular to A and consequently perpendicular to H. Inthis position of the line and…
Geometry, Descriptive
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