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 237
the circle the pole iswithout the circle; also that the polar of a point on the circle isthe tangent at the point, and the pole of a tangent is its point ofcontact. 208 EXERCISES ON EUCLID [238, Def. The foot of the perpendicular from the centre orfrom the pole on the polar is sometimes called the… … Fig. i, Let C be the centre of the circle and P the fixed point, and letthe tangents AD, BD at the extremities of the chord AB, passingthrough P, meet in D. Through D draw DP perpendicular to CP, meeting AB in F.
Geometry
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