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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 275
des and diagonals of the given quadrilateral bedenoted by the single letters A, B, C, D, E and F respectively,and the transversal cutting them by P, then (PA) will denotethe point in which P and A intersect. Let A be the pole of Awith respect to any circle, B of B, C of C and D of D. Sincethe line… … In like manner, it can be proved that E is the pole ©f E, andthat EFf is the polar of (EF). Now, find F the pole of P, and join F to A, B, C, D\E\ F. Then FA is evidently the polar of (PA), FB the polar of(PB), and so on. Hence the pencil P.-ABCDEF is formed by the polarsof the six points in which…Geometry
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