Godfrey, C. (Charles), 1873-1924, Siddons, A. W. (Arthur Warry) joint author · Cambridge, University Press · leaf 157
vary-ing line p define a range ofconstant cross-ratio. If two equicross pencilsahcd, ahcd be placed so thatthe points aa, hV, ca are col-linear, then dd will be collinearwith these three points. 138 COMPLETE QUADRILATERAL An interesting case is that of the complete figures defined byfour lines and…
Geometry, Modern
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