Elements of geometry and trigonometry. Revised and adapted to the course of mathematical instruction in the United States (1856)
Legendre, A. M. (Adrien Marie), 1752-1833, Davies, Charles, 1798-1876 · New York : A.S. Barnes · leaf 145
140 GEOMETEY. … But since the triangles ABO,AMB^ have a common angleJL, included between propor-tional sides, they are similar(b. IV., p. 20). Xow tlie triangleBAO being isosceles, AMBmust be isosceles also, andAB = BM ; but AB = OM;hence, also MB=MO; hence,the triangle BMO is isosceles. Again, in the isosceles…
Geometry · Trigonometry
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