

Online Plane Geometry: Excenters, Excircles, Exradius,
Triangle. Theorems and Problems

Excenter, Excircle of a triangle 
Index 3




Proposed Problem 159. Distances
from the Circumcenter to the Incenter and the Excenters. 

Proposed Problem 158. Relation
between the Circumradius, Incircle, Inradius and Exradii of a triangle.


Proposed Problem 120. Area
of triangle, incenter, excircles, tangent.


Proposed Problem 119. Area
of triangle, incenter, excircle, tangent.


Proposed Problem 118. Area
of triangle, incenter, excenter, tangent.


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.


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

Proposed Problem 86. Intouch and
Extouch Triangles, Excircles, Areas. 

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

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

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

Proposed Problem 40.
Triangle, Incenter, Excenter, Angles 80, 40, Distances. 

Euclid's Elements Book I, 23 Definitions. Onepage visual illustration.
Euclid's
Elements Book. Index 


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