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 273
, it can be proved that PL is thepolar of A, PAr of A and PR of C\ Also PB is the polar of B and PB of B\ Therefore the six lines PM, PB, PL, PF, PB and PR forma pencil in involution, q. e. d. 278. Describe a triangle which shall have its vertices onthree given straight lines, and its sides… … circle the triangle PQR, having its sides passing through A, B\6 (145). 279.] AND IN MODERN GEOMETRY. 245 Draw tangents to the circle at the vertices of the inscribedtriangle PQR. These tangents will form the required triangle. Because AB is the polar of C, therefore (238) the tangentsat P, Q will…
Geometry
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