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 270
5th Method. … 6th Method. 7th Method. 8th Method. Fig. 376. 9th Method.—The truth of the theorem appears alsoas a direct consequence of {360). U Fig. 377. 669 In an oblique angled triangle the squareof a side opposite an acute angle is equivalent to the sum of thesquares of the other two sides diminished by…
Geometry · Trigonometry
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