![](../landscape/landscape_px1.gif) |
|
![Online Geometry](h_triangle_center_910.jpg)
Online Plane Geometry: Excenters, Excircles, Exradius,
Triangle. Theorems and Problems
|
Excenter, Excircle of a triangle -
Index 2
|
![Excenter, Excircle, Index](excenter_excircle_17.jpg) |
|
![Geometry Problem 942](../school-college/p942-triangle-circumcircle-sagitta-inradius-exradius-1.jpg) |
Geometry Problem 942.
Triangle, Circles, Circumcircle, Sagitta, Incircle, Excircle, Inradius, Exradius, Metric Relations. |
![Right triangle, Excircles, Area](../school-college/p813-right-triangle-area-excircles-quadrilateral-1.jpg) |
Geometry Problem
813.
Right Triangle Area, Excircles, Cathetus, Tangency Points, Quadrilateral Area. |
![Triangle, Inradius, Exradii, Harmonic Mean](../problem/p766-triangle-altitudes-exradii-equal-harmonic-mean-1.jpg) |
Geometry Problem 766
Triangle, Altitudes, Exradii, Three Exradius, Equal Harmonic Mean. |
![Triangle, Inradius, Exradii, Harmonic Mean](../problem/p765-triangle-inradius-exradius-exradii-harmonic-mean-1.jpg) |
Geometry Problem 765
Triangle, Inradius, Exradii, Three Exradius, Harmonic Mean. |
![Excenter, Intersecting circles](../problem/p720_excenter_circles_1.jpg) |
Geometry Problem
720.
Excenter, Intersecting Circles, Angle, Measurement. |
![Triangle, Excenter, Angle](../problem/p707_excenters_angles_1.jpg) |
Geometry Problem
707.
Triangle, Excenters, Excircles, Angle Bisectors, Angle, Measurement. |
![Triangle, Excircles, Tangent, Concurrency](../geometry/p689_triangle_excircles_1.jpg) |
Geometry Problem 689.
Triangle, Three Excircles, Tangency points, Tangent lines, Concurrent Lines, Mind Map. |
![Triangle, Excircles, COncurrency](../geometry/p687_triangle_excircles_1.jpg) |
Geometry Problem 687.
Triangle, Three Excircles, Tangency points, Concurrent Lines. |
![Triangle, Excircles, Tangent](../geometry/p686_excircles_tangent_1.jpg) |
Geometry Problem 686.
Triangle, Three Excircles, Tangency points, Tangent lines, Semi-perimeter, Congruence. |
![Outer Nagel Point](../geometry/p684_nagel_point_exterior_1.jpg) |
Geometry Problem 684:
Outer Nagel Point.
Triangle, Excircles, Incircle Tangency points, Concurrent lines, Semi-perimeter, Ceva theorem. |
![Nagel Point](../geometry/p683_nagel_point_interior_1.jpg) |
Geometry Problem 683:
Nagel Point.
Triangle, Excircles, Tangency points, Concurrent lines, Semi-perimeter, Ceva theorem. |
![Gergonne Point Theorem](../geometry/p682_gergonne_point_ex_1.jpg) |
Geometry Problem 682: Gergonne External Point.
Triangle, Excircle, Tangency points, Concurrent lines, Semiperimeter, Ceva theorem. |
![Triangle, Incenter, Excenter, Similarity](../problem/p624_incenter_excenter_1.jpg) |
Geometry Problem 624
Triangle, Incenter, Excenter, Incircle, Excircle, Similarity. |
![Triangle, Incenter, Excenter, Distance](../problem/p626_incenter_excenter_1.jpg) |
Geometry Problem 626
Triangle, Distance from the Incenter to an Excenter. |
![Triangle, Incenter, Excenter, Concyclic Points](../problem/p623_incenter_excenter_1.jpg) |
Geometry Problem 623
Triangle, Incenter, Excenter, Incircle, Excircle, Concyclic Points. |
![Online Math: Geometry Problem 572, Right triangle and Circle](../problem/p572_right_triangle_circle1.jpg) |
Problem
572.
Right triangle, Median, Circle, Diameter, Excircle, Tangent circles. |
![Quadrilateral, Excircles](../problem/p569_quadrilateral_circle_1.jpg) |
Problem
569.
Quadrilateral, Excircles, Tangency Points, Congruence. |
![Triangle, Excircles, Congruence](../problem/p568_quadrilateral_circle_1.jpg) |
Problem
568.
Triangle, Excircles, Tangency Point, Congruence. |
![Geometry problem 567](../problem/p567_right_triangle_1.jpg) |
Problem
567.
Right triangle, Incircle, Excircle, Collinear tangency points. |
![Complete quadrilateral, Circles](../problem/p564_quadrilateral_circle_1.jpg) |
Problem
564.
Complete Quadrilateral, Incenter, Excenter, Concyclic Points, Incircle, Excircle. |
![Triangle, Incircle, Excircle, Inradius, Exradius](../problem/p419_triangle_incircle_17.jpg) |
Proposed Problem 419.
Triangle, Cevian, Incircle, Excircle, Inradius, Exradius |
![Triangle, Excenter, Parallel](../problem/p380_triangle_excenter_17.jpg) |
Proposed Problem 380.
Triangle, Excenter, Parallel to a side, Angle, Congruence. |
![Triangle, Excenter, Parallel](../problem/p379_triangle_excenter_17.jpg) |
Proposed Problem 379.
Triangle, Excenter, Parallel to a side, Angle, Congruence. |
![Triangle, Excenter, Internal and External angle bisector,](../problem/p376_triangle_excenter_17.jpg) |
Proposed Problem 376.
Triangle, Excenter, Internal and External Angle Bisectors. |
![Triangle, Excenter, Angle](../problem/p375_triangle_excenter_17.jpg) |
Proposed Problem 375.
Triangle, Excenter, External Angle Bisectors. |
![Triangle, Circumcenter, Incenter, Excenter, Collinear](../problem/p320_triangle_incenter_17.jpg) |
Proposed Problem 320.
Triangle, Circumcircle, Incenter, Excenter, Collinear points. |
![Right Triangle Circumcenter, Excenter](../problem/p294_triangle_excenter_17.jpg) |
Proposed Problem 294.
Right triangle, Circumcenter, Excenter, Hypotenuse, Perpendicular. |
![](ajima_malfatti_170_2.jpg) |
Second
Ajima-Malfatti Point
Interactive illustration.
Excenters of a triangle |
![](../geometry/feuerbach_points_17.jpg) |
Feuerbach Points and Nine-Point Circle with interactive
animation, manipulation, and step-by-step construction.
Incenter, Incircle, Excenters, Excircles. |
![](../geometry/incenter_excenter_17.jpg) |
Incenter, Excenter, Incircle, Excircle Using TracenPoche Dynamic
Software
Step-by-Step construction, Manipulation, and animation. |
![](../heron/heron__proof_170x100.jpg) |
Heron's Formula.
Key facts and
a purely geometric
step-by-step proof.
Incenter, Incircle, Excenter.
|
![](../semiperimeter_in_exc170.jpg) |
Semiperimeter, incircle and excircles of a triangle.
|
![](../Bevan170.jpg) |
The Bevan Point The
circumcenter of the excentral triangle.
Illustration with animation.
|
![](../pythagoras/right_triangle_facts_170.jpg) |
Right Triangles, Formulas and Facts
Pythagorean theorem, Similarity, Geometric mean,
hypotenuse, cathetus (legs), semiperimeter, altitude, median,
similar shapes areas, centers, orthocenter, incenter,
incircle, centroid, circumcenter, radius, inradius,
excenters, exradius. |
![](feuerbach_theorem_acute_170.jpg) |
Feuerbach
Theorem, Acute Triangle illustration
|
![](feuerbach_theorem_obtuse_17.jpg) |
Feuerbach
Theorem, Obtuse Triangle illustration
|
![](feuerbach_theorem_right_170.jpg) |
Feuerbach
Theorem, Right Triangle illustration
|
![Problem 207: Hypotenuse](../problem/p207_right_triangle_hypoten.jpg) |
Proposed Problem 207. Right Triangle, Hypotenuse, Incenter,
Inradius, Excenter, Exradius relative to the hypotenuse. |
![Elearn 206](../problem/p206_right_triangle_area_17.jpg) |
Problem 206. Area of a Right Triangle, Inradius, and
Excenter, Exradius relative to the hypotenuse. |
![Elearn 204](../problem/p204_right_triangle_circle_.jpg) |
Proposed Problem 204. Right Triangle, Incircle, Excenters,
Excircles, Inradius, Exradii. |
![Problem 202 Right triangle, excircles](../problem/p202_right_triangle_circle_.jpg) |
Proposed Problem 202. Right Triangle, Incircle, Excenters, Excircles
relatives to catheti, Points of Tangency, Exradius, Semiperimeter.
|
![Elearning 200: Right Triangle](../problem/p200_right_triangle_17.jpg) |
Proposed Problem 200. Right Triangle, Incircle, Excircles, Points of
Tangency, Inradius. |
![Elearning 197: Triangle Area](../problem/p197_area_triangle_radius_1.jpg) |
Proposed Problem 197. Area of a
Triangle, Side, Incircle, Inradius, Excenter, and Exradius. |
![Elearning 196: Inradius, Exradii](../problem/p196_triangle_radius_17.jpg) |
Proposed Problem 196. Triangle,
Incircle, Inradius and Exradii Formula. |
![Triangle Centers Video](triangle_center_video_17.jpg) |
Journey to the
Center of a Triangle (1976). Incenter, Circumcenter, Centroid,
Orthocenter.
|
![Geometry: Triangle Area, inradius, exradii](../problem/p195_area_triangle_radius_1.jpg) |
Proposed Problem 195. Area of a
Triangle, Incircle, Inradius, Excenters, Exradii. |
Go to Page:
Previous |
1 | 2 |
3 |
Next |
|
|
|
|
|
![](../landscape/landscape_bg_right.gif) |
![](../landscape/landscape_px1.gif) |