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
equal angles. 09o. If, on the hjrpotenuse and sides of a rightangled triangle, semicircumferences be described,that upon the hypotenuse passing through the ver-tex, the sum of the crescents thus formed will beequal to the area of the triangle. THEOEEMS IN SPECIAL GEOMETRY. 257 696. The bisectors… … Fig. 3S9. THE NINE POINTS CIRCLE 697. In any triangle the centres ofthe THREE sides, the feet of the threeperpendiculars from the vertices uponthe opposite sides or sides produced,and the three middle points of thedistances from the vertices to thecommon intersection of the perpen-diculars, are…
Geometry · Trigonometry
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