Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 92
Two lines intersectwhen they pass through a common point. Two lines areparallel when they are everywhere equally distant. If twostraight lines lie in the same plane, they either intersect or areparallel. This is not necessarily the case, however, with anytwo lines in space. 93. Parallel Lines in… … Ftg. 117. projecting planes will be parallel, their intersections, Aq andBq, with the plane Q will be parallel. In general, if lines A and l> are parallel, it is definitelyshown by the simultaneous condition that Ah is parallel to Ilh,and A is parallel to />. Profile lines are an exception ;…
Geometry, Descriptive
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