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Conway's Circle
Autor:
Alex CHIK
GeoGebra
Alexander Bogomolny,
Conway's Circle
from Interactive Mathematics Miscellany and Puzzles
https://www.cut-the-knot.org/Curriculum/Geometry/ConwaysCircle.shtml
, Accessed 21 November 2017
gMath 互動數學教室
http://www.gmath.hk
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