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 244
d CB are equal; therefore HA and KB are also equal. Q. E. D. Next, by polars, Fig. 2. Produce 6rZ) and EF to meet in P, which is a point on thepolar of C (241). Let PQ be the polar of C. PQ is obviouslyparallel to AB. Produce GF to meet PQ in Q, and join PC. Because GQ is drawn through C and its… … Let C be the centre of the circle, and A, B the two points.Find BE the polar of A, and EG the polar of B. Because theangles CDE and CGE are right (237), therefore the angle PEGbetween the polars is equal to the angle ACB subtended by ABat C. Q. E. D. 245. The anharmonic ratio of four points in a…
Geometry
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