Newcomb, Simon, 1835-1909 · New York, H. Holt and company · leaf 115
t is, the distance SG is equal to the line GG multipliedby a factor which is independent of the direction of the radiiGPf GP; therefore the point S is the same for all pairs ofparallel radii. Q. E. D. Gase of oppositely directed radii. If the radii CP, GPbe drawn in opposite directions, it may be… … Def. The two points through which pass all lines joiningthe ends of parallel radii of two circles are called the cen-tres of similitude of the two circles. The direct centre of similitude is that determinedby similarly directed radii. The inverse centre of similitude is that determinedby oppositely…
Geometry, Analytic
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