Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 114
Fig. 158. Fig. 15it. But let the line A, Fig. 159, be perpendicular to the planeQ, and let us pass through A the plane T perpendicular to //. 94 DESCRIPTIVE GEOMETRY [XI, § 113 Since HT coincides with Ah, and Ah is perpendicular to HQ,it follows that HT is perpendicular to HQ. Hence we havethe…
Geometry, Descriptive
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