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 182
t one extremity of the line, as B, erecta perpendicular equal to half the line, that is,make BO = ^ AB. With 0 as a centre, describea circumference passing through B. Draw AO,and take AC equal to AD. Then is AB dividedin extreme and mean ratio at C, so that AB :AC :: AC : CB. To prove it, produce… … 16:^ ELEMENTAP.Y PLANE GEOMETRY. 10. I^rob*—To inscribe a regular decagon in a circle, and hence a,regular pentagon, and regular j^olygons of 20, 40, 80, etc., sides. Solution. {a) X .:^
Geometry · Trigonometry
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