Godfrey, C. (Charles), 1873-1924, Siddons, A. W. (Arthur Warry) joint author · Cambridge, University Press · leaf 77
= -1, ACy AD_ 1 cb/ db~ AC CB AD DB PC QC OD OD PC = CQ. 58 … PC = CQ Now fig. 32. PC OC CQ PC OC CQ And from similar triangles as before, AC _ PCAD~OD and {AB, CD} = -1< ^ QCDB~ CD AD~ CB CBDB AC /AD CB/ DB.. {AB, CD} is a harmonic range. Definition. If a pencil of four lines divides one transversal(and therefore every transversal*) harmonically, the…
Geometry, Modern
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