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 171
PROPOSITION ^TL ■Circles are similar figures. Dem.—Let Oa and OA be the radii of anytwo ciicles. Place the circles so that they shallbe concentric, as in the figure. Inscribe the regu-lar hexagons, as abcdef, ABCDEF. Conceive thearcs AB, BC, etc., of the outer circumference, bi-sected, and the…
Geometry · Trigonometry
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