American text books of art education : Geometrical drawing (1873)
Smith, Walter, 1836-1886 · Boston : James R. Osgood & Co. · leaf 71
int, as 1, to cut the given line 2 3 in 5; 1 5 will make 90°with 2 3. If the angle required be 45°, bisect the angle 4 1 5 by line1 6, then 1 G will make an angle of 45° with line 2 3. Prob. 73.— To place two given lines A B and C D at right anglesat their centres. Draw a line E F equal to the… … „r^
Geometrical drawing
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