Smart, Edward Howard · London : Macmillian and Co. · leaf 60
les (in opposite senses) with the bounding lines of the angle arecalled isogonal conjugates. Prove that if three lines through thevertices of a triangle are concurrent, their isogonal conjugates areconcurrent. CHAPTER IV. HARMONIC FORMS AND THEIR ELEMENTARYPROPERTIES. § 1. Def. If four points A, B,… … ABC D Fig. 11. Draw a straight line APX making any convenient aijglewith AC. Take a point P on it. Join BP, and draw CQparallel to BP. Mark off PQ on AP equal to - PQ. JoinCQ, and draw PD parallel to CQ. TV, AB_AP_ AP _ AD ^^^ BC~PQPQ^~DC so that D is the point required. HARMONIC FORMS 33 § 3.…
Geometry, Projective
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