Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 76
^-projection takes the position ach, parallel to OL. VIII, § 79] TRUE LENGTH OF A LINE 55 In this revolution, the angle which the line makes with theaxis does not change. Consequently, the angle which theline makes with H, and therefore the length of the if-projection,remain constant. The point b…
Geometry, Descriptive
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