American text books of art education : Geometrical drawing (1873)
Smith, Walter, 1836-1886 · Boston : James R. Osgood & Co. · leaf 50
the distance 1 A round the circle in points A, B, C, D, and jcin thepoints A B, B C, C D, D 1. Prob. 40.— On a gioen altitude A B, to construct an equilateraltriangle. By Prob. 5 erect a line at B perpendicular on the right of the lineA B, and continue it beyond B indefinitely. With A as centre,… … to cut the perpendicular line in C and D. A C D is the requiredtriangle. Prob. 41. — To construct an isosceles triangle, having a given alti-tude A B, and a git-en base C D. At point B erect a perpendicular by Prob. 5. Bisect C D, andmark off half of it on the perpendicular on each side of B in…
Geometrical drawing
Internet Archive · Boston Public Library · Public Domain Mark 1.0. Free to use for anything.
