Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 189
s. A line perpendicular to a plane and indefi-nite in length may be drawn by making the projections of theline perpendicular to the traces of the plane (§ 112). Throughthe given point draw a line perpendicular to the plane. Assumea second point on this line. Find the true length of the linebetween… … Construction by First Analysis (Fig. 250). Let a, lying in Q,be the given point. Draw the line ac (ahch, a1^), indefinite inlength and perpendicular to Q. Assume a point c (c*, C) on XVII, § 148] COUNTER-REVOLUTION OF PLANES 169 this line, and find the true length, avcrv, of etc (Prob. 3, §…
Geometry, Descriptive
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