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![Online Geometry](h_triangle_center_910.jpg)
Online Plane Geometry: Excenters, Excircles, Exradius,
Triangle. Theorems and Problems
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Excenter, Excircle of a triangle -
Index 3
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![Excenter, Excircle, Index](excenter_excircle_17.jpg) |
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![Triangle Elearning 159](../problem/p159_elearning_triangle_17.jpg) |
Proposed Problem 159. Distances
from the Circumcenter to the Incenter and the Excenters. |
![Geometry Problem 158](../problem/p158_elearning_triangle_17.jpg) |
Proposed Problem 158. Relation
between the Circumradius, Incircle, Inradius and Exradii of a triangle.
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Proposed Problem 120. Area
of triangle, incenter, excircles, tangent.
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![Elearn 119: Triangle area.](../problem/p119_area_triangle_incenter_17.jpg) |
Proposed Problem 119. Area
of triangle, incenter, excircle, tangent.
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![Problem 118](../problem/p118_area_triangle_elearn_17.jpg) |
Proposed Problem 118. Area
of triangle, incenter, excenter, tangent.
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![Elearning 117 Areas](../problem/p117_area_triangle_elearn_17.jpg) |
Proposed Problem 117. Area
of triangle, incenter, excircles, tangent.
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![Elearning 114: Area](../problem/p114_area_triangle_elearn_17.jpg) |
Proposed Problem 114. Area of
triangle, incenter, incircle, excircle.
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![Elearning 113: Areas](../problem/p113_area_triangle_elearn_17.jpg) |
Proposed Problem 113. Area of
triangle, incenter, incircle, excircle.
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![](../puzzle/p086_intouch_extouch_17.jpg) |
Intouch and Extouch Triangles. Puzzle cut: 20 Piece Classic
Based on Proposed Problem 86. |
![](../problem/p086_extouch_triangle_17.jpg) |
Proposed Problem 86. Intouch and
Extouch Triangles, Excircles, Areas. |
![](../puzzle/p085_contact_triangle_17.jpg) |
Contact Triangles. Puzzle cut: 22 Piece Polygons
Based on Proposed Problem 85. Excircles |
![](../problem/p085_contact_triangle_17.jpg) |
Proposed Problem 85. Contact
Triangles Areas, Incircle, Excircles. |
![](../problem/p084_contact_triangle_17_.jpg) |
Proposed Problem 84. Contact
Triangles Areas, Incircle, Excenter, Excircle, Inradius, Exradius. |
![](../problem/p040_angle_170.jpg) |
Proposed Problem 40.
Triangle, Incenter, Excenter, Angles 80, 40, Distances. |
![Euclid's Elements 23 definitions](../geometry/euclid_elements_definition_170.jpg) |
Euclid's Elements Book I, 23 Definitions. One-page visual illustration.
Euclid's
Elements Book. Index |
![](../problem/p076_square_circle_17.jpg) |
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