A treatise on special or elementary geometry (1877)
Olney, Edward, 1827-1887, Olney, Edward, 1827-1887. Elements of trigonometry, plane and spherical · New York : Sheldon · leaf 48
Fig. 43. Fig. 44. Ex. 3. Suppose I take a square card like CEDF, with a hole in onecorner as at c, and sticking two pins firmly in my paper, as at A andB,, place the corner of the card between them, as in Fig. 44, andthen, keeping the sides of the card snug against the pins, put a 28 ELEMENTARY…
Geometry · Trigonometry
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
