Tangent Circles, Theorems and Problems: Table of Content
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Circumcircles or circumscribed circle
Proposed Problem
93. Similar Triangles, Circumcircles, Parallelogram.
Tangent circles. 

Circumcircles or circumscribed circle
Proposed Problem
92. Similar Triangles, Circumcircles, Circumradii, Parallel. 

Feuerbach Points and NinePoint Circle with interactive
animation, manipulation, and stepbystep construction.
Tangent circles. 

Three
Tangent Circles
Theorem Using TracenPoche Dynamic Software
StepbyStep construction, Manipulation, and animation. 

Sangaku Geometry Theorem: Three circles and a tangent line. 

Arbelos, Inscribed Circle and Concyclic Points Cyclic
Quadrilateral.
Tangent circles. 

Proposed Problem
57: Angle bisector, circles Cyclic
Quadrilateral.
Tangent circles. 

Proposed Problem
56: Angle bisector, circles Parallel
Lines.
Tangent circles. 

Proposed Problem
55: Angle bisector, circles Cyclic
Quadrilateral.
Tangent circles. 

Proposed Problem
54: Angle bisector, circles Midpoint of
arc.
Tangent circles. 
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