Exercises on Euclid and in modern geometry for the use of schools, private students, and junior university students (1881)
McDowell, James L · Cambridge, Deighton, Bell, and Co. · leaf 111
DE and FE must form one continuedstraight line. Q. E. D. Cor. If the straight lines drawn from 0 make equal angleswith the sides, in the same order, it can be proved in the samemanner that the three points D, E, F are still in the same straightline. 119. The circles circumscribing the four… … Fig. i, triangles AED, DEC, CEB and BAF. Let the circles circum-scribing the triangles BEG and CFD intersect in 0. Join EO, BO, CO, DO, FO. Because (Fig. 1) BEOC is a quadrilateral in a circle, the angle 119.] AND IN MODERN GEOMETRY. 83 GOE is equal to ABF (III. 22) and the angles DOC and CFD inthe…
Geometry
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