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 337
907. Theo. … Fig. 506. The diago7ials joining the opposite vertices of a cir-cumscribed hexagon intersect in acommon ptoint. Dem.—Consider AB. BC, CD, EF fourfixed tangents cut by ED and FA. Then[PNDE] = [AQMF] {989). Hence the an-harmonic ratios of B-P,N,D,E,* andC-A,Q,M,F are equal (985); and sincethey have a…
Geometry · Trigonometry
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