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Online Plane Geometry: Excenters, Excircles, Exradius,
Triangle. Theorems and Problems
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Excenter, Excircle of a triangle -
Index 2
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Geometry Problem 942.
Triangle, Circles, Circumcircle, Sagitta, Incircle, Excircle, Inradius, Exradius, Metric Relations. |
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Geometry Problem
813.
Right Triangle Area, Excircles, Cathetus, Tangency Points, Quadrilateral Area. |
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Geometry Problem 766
Triangle, Altitudes, Exradii, Three Exradius, Equal Harmonic Mean. |
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Geometry Problem 765
Triangle, Inradius, Exradii, Three Exradius, Harmonic Mean. |
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Geometry Problem
720.
Excenter, Intersecting Circles, Angle, Measurement. |
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Geometry Problem
707.
Triangle, Excenters, Excircles, Angle Bisectors, Angle, Measurement. |
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Geometry Problem 689.
Triangle, Three Excircles, Tangency points, Tangent lines, Concurrent Lines, Mind Map. |
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Geometry Problem 687.
Triangle, Three Excircles, Tangency points, Concurrent Lines. |
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Geometry Problem 686.
Triangle, Three Excircles, Tangency points, Tangent lines, Semi-perimeter, Congruence. |
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Geometry Problem 684:
Outer Nagel Point.
Triangle, Excircles, Incircle Tangency points, Concurrent lines, Semi-perimeter, Ceva theorem. |
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Geometry Problem 683:
Nagel Point.
Triangle, Excircles, Tangency points, Concurrent lines, Semi-perimeter, Ceva theorem. |
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Geometry Problem 682: Gergonne External Point.
Triangle, Excircle, Tangency points, Concurrent lines, Semiperimeter, Ceva theorem. |
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Geometry Problem 624
Triangle, Incenter, Excenter, Incircle, Excircle, Similarity. |
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Geometry Problem 626
Triangle, Distance from the Incenter to an Excenter. |
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Geometry Problem 623
Triangle, Incenter, Excenter, Incircle, Excircle, Concyclic Points. |
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Problem
572.
Right triangle, Median, Circle, Diameter, Excircle, Tangent circles. |
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Problem
569.
Quadrilateral, Excircles, Tangency Points, Congruence. |
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Problem
568.
Triangle, Excircles, Tangency Point, Congruence. |
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Problem
567.
Right triangle, Incircle, Excircle, Collinear tangency points. |
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Problem
564.
Complete Quadrilateral, Incenter, Excenter, Concyclic Points, Incircle, Excircle. |
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Proposed Problem 419.
Triangle, Cevian, Incircle, Excircle, Inradius, Exradius |
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Proposed Problem 380.
Triangle, Excenter, Parallel to a side, Angle, Congruence. |
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Proposed Problem 379.
Triangle, Excenter, Parallel to a side, Angle, Congruence. |
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Proposed Problem 376.
Triangle, Excenter, Internal and External Angle Bisectors. |
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Proposed Problem 375.
Triangle, Excenter, External Angle Bisectors. |
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Proposed Problem 320.
Triangle, Circumcircle, Incenter, Excenter, Collinear points. |
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Proposed Problem 294.
Right triangle, Circumcenter, Excenter, Hypotenuse, Perpendicular. |
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Second
Ajima-Malfatti Point
Interactive illustration.
Excenters of a triangle |
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Feuerbach Points and Nine-Point Circle with interactive
animation, manipulation, and step-by-step construction.
Incenter, Incircle, Excenters, Excircles. |
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Incenter, Excenter, Incircle, Excircle Using TracenPoche Dynamic
Software
Step-by-Step construction, Manipulation, and animation. |
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Heron's Formula.
Key facts and
a purely geometric
step-by-step proof.
Incenter, Incircle, Excenter.
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Semiperimeter, incircle and excircles of a triangle.
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The Bevan Point The
circumcenter of the excentral triangle.
Illustration with animation.
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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. |
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Feuerbach
Theorem, Acute Triangle illustration
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Feuerbach
Theorem, Obtuse Triangle illustration
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Feuerbach
Theorem, Right Triangle illustration
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Proposed Problem 207. Right Triangle, Hypotenuse, Incenter,
Inradius, Excenter, Exradius relative to the hypotenuse. |
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Problem 206. Area of a Right Triangle, Inradius, and
Excenter, Exradius relative to the hypotenuse. |
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Proposed Problem 204. Right Triangle, Incircle, Excenters,
Excircles, Inradius, Exradii. |
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Proposed Problem 202. Right Triangle, Incircle, Excenters, Excircles
relatives to catheti, Points of Tangency, Exradius, Semiperimeter.
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Proposed Problem 200. Right Triangle, Incircle, Excircles, Points of
Tangency, Inradius. |
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Proposed Problem 197. Area of a
Triangle, Side, Incircle, Inradius, Excenter, and Exradius. |
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Proposed Problem 196. Triangle,
Incircle, Inradius and Exradii Formula. |
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Journey to the
Center of a Triangle (1976). Incenter, Circumcenter, Centroid,
Orthocenter.
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Proposed Problem 195. Area of a
Triangle, Incircle, Inradius, Excenters, Exradii. |
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