Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 93
us choice of auxiliary linesand planes often may simplify materially the necessary drawing.Such a case is treated in § 78. It follows that the student should make a careful study of theway in which his choice affects any given solution, and thusstrengthen his ability to select instinctively the… … > This idea of arbitrarily introducing a foreign element into a problranin order to arrive at a solution is frequently used in mechanics, biology,chemistry, medicine, and other sciences, as well as in all branches of puremathematics. VI, § 66] POINTS, LINES, AND PLANES 75 Since the traces of any…
Geometry, Descriptive
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