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 341
pass (1002). Now, drawing thediagonals PM, NQ, OL, they are the polarsof the intersections of the opposite sides ofthe inscribed hexagon, as PM, polar to theintersection of DE and CB (?); and hencethey pass through a common point, as V.Thus we have Brianchons theorem, viz. ;The lines joining the… … Fig. 513. 1013.—The three following theorems are of frequent use in ap-plying the theory of reciprocation. 1014. TJieo. — The angle included by tiuostraight lines is equal to the angle included hy thelines joining their 2Joles to the centre of the auxiliarycircle. Dem.—The pole of a line being in…
Geometry · Trigonometry
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