

Online Geometry: Incenter, Incircle, Inradius of a triangle, Theorems
and Problems.

Incenter of a triangle  Table
of Content, Page 1




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

Triangle Centers. 

Distances between Triangle Centers
Index.


GeoGebra, Dynamic Geometry: Incenter and Incircle
of a Triangle.
HTML5 Animation for Tablets (iPad, Nexus..) 

Geometric Art: Inscribed Circle, Incircle for Kids, Delaunay Triangulation. 

Gergonne Points
Index
Triangle Center 

Nagel Points
Index
Triangle Center 

Right triangle, Altitude, Incircle
Right Triangle, Altitude to the Hypotenuse, Incircle, Incenter, Inradius, Angle Bisector, Theorems and Problems, Index. 

First AjimaMalfatti Point
Animated illustration. 

Second
AjimaMalfatti Point
Interactive illustration. 

Feuerbach Points and NinePoint Circle with interactive
animation, manipulation, and stepbystep construction.
Incenter, Incircle, Excircles. 

Problem 79: Triangle.
Similarity, Altitudes, Orthocenter, Incenter, Incircles, Inradii. 

Sawayama Thebault's
theorem
Incenter, Incircle, Circumcircle. 

Incenter, Excenter, Incircle, Excircle Using TracenPoche Dynamic
Software
StepbyStep construction, Manipulation, and animation. 

Three Tangent Circles Theorem Using TracenPoche Dynamic Software
StepbyStep construction, Manipulation, and animation.
Incenter of a triangle. 

Distance between the Incenter and the Centroid of a
Triangle.
Formula in terms of the sides a,b,c. 

Geometry Problem 1271.
Triangle, Incircle, Incenter, Excircle, Excenter, Escribed Circle, Tangency Points, Six Concyclic Points. 

Geometry Problem 1269.
Triangle, Incircle, Incenter, Inscribed Circle, Tangency Points, Perpendicular, 90 Degrees, Angle Bisector. 

Geometry Problem 1267.
Triangle, Incircle, Excircle, Circle, Tangency Points, Perpendicular, 90 Degrees, Parallelogram. 

Geometry Problem 1265.
Triangle, Incircle, Circle, Tangency Points, Perpendicular, 90 Degrees, Angle Bisector. 

Geometry Problem 1231
Triangle, Orthocenter, Incenter, Circumcenter, Angle Bisector, Center, Circle. 

Geometry Problem 1217
Triangle, Circle, Excenter, Incenter, Angle Bisector, Cyclic Quadrilateral, Circumcircle, Tangent Line. 

Geometry Problem 1207
Triangle, Circle, Incenter, Circumcenter, Excenter, Circumradius, Perpendicular, 90 Degrees. 

Geometry Problem 1199
Equilateral Triangle, Square, Altitude, Circle, Incircle, Inradius, Metric Relations. 

Geometry Problem 1181
Cyclic Quadrilateral and Tangential Quadrilateral, Diameter as a Diagonal, Incenter, Circumcenter. 

Geometry Problem 1155.
Right Triangle, Altitude, Incenter, Incircle, Area. 

Geometry Problem 1149.
Isosceles Triangle, Altitude, Cevian, Incircles, Tangent, Congruence. 

Dynamic Geometry Problem 1148
Static Geometry Problem 1148.
Right Triangle, Incircle, Circumcircle, Tangent, Radius. GeoGebra, HTML5 Animation for Tablets (iPad, Nexus). 

Geometry Problem 1129.
Isosceles Triangle, Circumcenter, Incenter, Parallel Lines, Perpendicular Lines. 
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Last updated: Oct 2, 2016






