
Circles  Table of Content
(Page 20)




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

Artwork of Problem 1169,
Complete Quadrilateral 

Intouch and Extouch Triangles.
Puzzle cut: 20 Piece Classic
Based on Proposed Problem 86. 

Geometry in Venetia Diamond Mine, South Africa. Circular Shapes. 

Proposed Problem
86. Intouch and Extouch Triangles, Areas. 

Taylor Circle Theorem Using TracenPoche Dynamic Software
StepbyStep construction, Manipulation, and animation.
Henry Martyn Taylor and the blind student of mathematics


Proposed Problem 85. Contact
Triangles Areas, Incircle, Excircle. 

Proposed Problem 84. Contact
Triangles Areas, Incircle, Excircle, Inradius, Exradius. 

Proposed Problem 83. Area of the
Excircle Contact Triangle, exradius, circumradius. 

Proposed Problem 82. Area of the
Contact Triangle, inradius, circumradius. 

Proposed Problem 81. Area of a
triangle, side, inradius, circumradius. 

Proposed Problem 80. Area of a
triangle, side, incircle, inradius. 

Proposed Problem 79: Triangle.
Similarity, Altitudes, Orthocenter, Incircles, Inradii. 

Proposed Problem 78: Angles of a Circle.
Perpendicular and parallel lines, Midpoint, Diameter, Chord, Cyclic
quadrilateral, Congruence.


Proposed Problem 77: Angles of a Circle.
Parallel lines, Cyclic quadrilateral.


Proposed Problem
76: Area of a Circle. Square,
Circle, Circular Sector. 

Proposed Problem
74: Three Intersecting Circles. Cyclic
quadrilateral, Angles.


Proposed Problem
73: Three Intersecting Circles. Cyclic
quadrilateral.

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