Detroit. Public schools. Dept. of instruction, teacher training and research. [from old catalog], Kepler, Frank Roy. [from old catalog] · Detroit · leaf 10
r/G. 3 (7) When a line is parallel to either plane of projectionits view on that plane represents the true length of the line;and the angle which this view makes with the Ground Line isequal to the angle which the line in space makes with theplane to which it is not parallel, Fig. 9. (8) A line…
Projection
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