Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 168
Fig. 226. Fig. 227. In Fig. 227, the given plane Q is parallel to the ground line.The general case still applies, but there is an extra detail inthe construction. As before, assume any point c in the line A.From c drop the perpendicular B to the plane Q. Find theangle, S, between the lines A and B.…
Geometry, Descriptive
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