Circles
Triangle centers by Antonio Gutierrez from Geometry Step by Step from the Land of the Incas.
Geometry. Triangle Centers. Antonio Gutierrez
MathWorld's definition of "circular segment" wolfram
Circular Segment -- From MathWorld
Reflections of a Point on the Circumcircle at cut-the-knot
Isogonal image of the circumcircle at cut-the-knot
Isogonal image of the circumcircle. What is it?
Concyclic Circumcenters: A Dynamic View at cut-the-knot
Concyclic Circumcenters: A Dynamic View
Circumcevian Triangle at cut-the-knot
Circumcevian Triangle
Angle Trisectors on Circumcircle at cut-the-knot
Angle Trisectors on Circumcircle
http://www.froola.com - now!
Transitivity in Action — Remarkable Points in a Triangle at cut-the-knot
Transitivity in Action
Malfatti's Problem at cut-the-knot
Malfatti's Problem
Malfatti's Problem wolfram
Malfatti's Problem -- From MathWorld
Malfatti Circles wolfram
Malfatti Circles -- From MathWorld
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It uses material from the Wikipedia articles :
Altitude (triangle) , Circular segment , Circumcircle , Incircle and excircles of a triangle , Malfatti circles , .
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the Froola link list about "Circles".