Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 155
s, which are stated below. Analysis. The required result may be obtained by revers-ing the construction of Problem 18. Case I. Given one trace and the angle which the plane makesivith the same coordinate plane. Construction (Fig. 212). Let HQ and the angle «, which Qmakes with H, be given. Assume… … Fig. 212. Fig. 213. with H. Then R intersects the axis A at the point c (C, c*).Let R now be supposed to be revolved back about the axis Auntil IIR coincides with HQ ; the point c remains fixed. Sincec is in V, VQ must pass through c, and is determined by thispoint and the point in which HQ…
Geometry, Descriptive
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