Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 79
direction of its projection on that plane, are known. In order to give the line a definite position in space, it willbe assumed, in addition to the above data, that one end of theline is located at a given fixed point a. It is evident geometrically that the position of the line inspace is now… … Fig. 100 (repeated).
Geometry, Descriptive
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