Legendre, A. M. (Adrien Marie), 1752-1833, Brewster, David, Sir, 1781-1868, Davies, Charles, 1798-1876 · New York, Wiley & Long · leaf 195
the angle BAC=PEG ;then will the two triangles be equalin all their pait;^. For, the triangle EFG may beplaced on the triangle ABC, or onABD symmetrical with ABC, just astwo rectilineal triangles are placedupon each other, when they have anequal angle included between equal sides. Hence all the… … PROPOSITION XI. THEOREM. Two tnangles on the same sphere, or on equal spheres, are equalin all their parts, when two angles and the included side of theone are equal to two angles and the included side of the other,each to each. For, one of these triangles, or the triangle symmetrical WMthit, may…
Trigonometry · Geometry
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