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 271
is constant. … Let the tangents at A, B, C, D meet the tangent at P in thepoints A\ B, C, D respectively. By (238, a) A is the pole of PA, B of PB, C of PC, and Dof PD, and by (245) the anharmonic ratio of four points in astraight line is the same as that of the pencil formed by theirpolars. Therefore [ABCD] =…
Geometry
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