Godfrey, C. (Charles), 1873-1924, Siddons, A. W. (Arthur Warry) joint author · Cambridge, University Press · leaf 26
ception to the rule that a finite straight linemay be divided both internally and externally in a given ratio. This is the case of the ratio of equality. These and other exceptions can be removed by means of themathematical fiction called infinity. It will be seen later on that, by means of the… … fig. 4, Let a straight line, always passing through O, start from theposition OP and revolve in a counter-clockwise direction, until itbecomes parallel to the straight line PPi- In each of its positions, the revolving line cuts the linePPi in a single point, until the revolving line becomes…
Geometry, Modern
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