Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 113
Fig. 155. Fig. 15li. Q is perpendicular to H, Bh must coincide with IIQ; that is,the projections Ah and Bh are perpendicular to each other. Itmay be noted that the line B need not necessarily intersect theline A, since any line lying in Q is considered to be perpen-dicular to A. What is true of the…
Geometry, Descriptive
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