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 328
AF X BC* parallel to BF, we have But, HD being drawn Fio. BF or HD = AD BF PC SC AF X BC AF X BC whence HD is known, as AD, BF, PC, AF, BC can be measured. Tlie points Pand H determine the required line. 953. Def.—The Complete Quaclrilateral is the figureformed by four lines meeting in sixpoints.… … Fig. 488. 954. Tlieo.—The middle points of the three diagonals of a completequadrilateral are in the same straight line. Dem.—m, n, o being the centres of the diagonals of the complete quadrilat-eral, in the preceding figure, are in the same straight line. Bisect the sides ofthe triangle FDE, as at…
Geometry · Trigonometry
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