Online Geometry

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

Excenter, Excircle of a triangle - Index 3

Excenter, Excircle, Index


Triangle Elearning 159

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

Geometry Problem 158

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

Problem 120: Triangle area. Elearning.

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

Elearn 119: Triangle area.

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

Problem 118

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

Elearning 117 Areas

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

Elearning 114: Area

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

Elearning 113: Areas

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 23 definitions

Euclid's Elements Book I, 23 Definitions. One-page visual illustration.
Euclid's Elements Book. Index


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Last updated: Mar 9, 2022