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 276
radius ishalf the radius of the circumscribed circle. Sugs.—The student will do well to confine his at-tention in the first instance to the first figure, andafter he sees the demonstration in this case—i. e.,when the perpendiculars fall within, to trace it inthe case of an obtuse angled triangle,… … Fig. 300.
Geometry · Trigonometry
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