

Geometry: Incenter, Incircle, Inradius of a triangle, Theorems
and Problems.




Proposed Problem 117. Area
of triangle, incenter, excircles, tangent.


Proposed Problem 114. Area of
triangle, incenter, incircle, excircle.


Proposed Problem 113. Area of
triangle, incenter, incircle, excircle.


Proposed Problem 110. Area of
Contact Triangle. Incenter, Incircle. 

Proposed Problem 96. Similar
Triangles, Incenters, Parallelogram. 

Proposed Problem 95. Similar
Triangles, Inradii, Parallel. 

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

Proposed Problem 86. Intouch and
Extouch Triangles, Areas. 

Contact Triangles. Puzzle cut: 22 Piece Polygons
Based on Proposed Problem 85. 

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

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

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

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

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

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

Proposed Problem 68: Triangle, Incircle, Inradius, Tangent, Similarity.


Proposed Problem 64: Triangle, Incircle, Transversal. 

Proposed Problem 52: Triangle, angles, incircle.


Puzzle: Sangaku Problem. Incircles, incenters, 
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