GeoGebra
Nine-point Circle
Nine-point Circle (Part 1)
Nine-point Circle (Part 2)
Nine-point Circle (Part 3)
Nine-point Circle (Part 4)
Feuerbach's Theorem
16 Points of Tangency
GeoGebra
Nine-point Circle
Author:
Alex CHIK
Topic:
Circle
script of a talk by Mr. C.K. Leung on 25/4/2015 cover picture taken from
http://www-history.mcs.st-and.ac.uk/Mathematicians/Feuerbach.html
GeoGebra 互動數學教室
http://www.geogebra.hk
Nine-point Circle (Part 1)
Nine-point Circle (Part 2)
Nine-point Circle (Part 3)
Nine-point Circle (Part 4)
Feuerbach's Theorem
16 Points of Tangency
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