American text books of art education : Geometrical drawing (1873)
Smith, Walter, 1836-1886 · Boston : James R. Osgood & Co. · leaf 67
l contain more than 90°, because it is greater than a right angle,and an acute angle less than 90°, because it is less than a right angle. Prob. 67.—To consti-uct an angle of 45° atpoint B on a gioen lineA B. Draw any line A E. By Prob. 5, erect a perpendicular at pointB. ABC will therefore be a…
Geometrical drawing
Internet Archive · Boston Public Library · Public Domain Mark 1.0. Free to use for anything.
