Editing Incircle and excircles (section)

==External links==
* [https://mathalino.com/reviewer/derivation-of-formulas/derivation-of-formula-for-radius-of-incircle Derivation of formula for radius of incircle of a triangle], MATHalino
* {{MathWorld|title=Incircle|urlname=Incircle}}

===Interactive===
* [https://www.mathopenref.com/triangleincenter.html Triangle incenter]; [https://www.mathopenref.com/triangleincircle.html Triangle incircle]; [https://www.mathopenref.com/polygonincircle.html Incircle of a regular polygon] (with interactive animations)
* [https://www.mathopenref.com/constincircle.html Constructing a triangle's incenter / incircle with compass and straightedge] An interactive animated demonstration
* [https://www.cut-the-knot.org/Curriculum/Geometry/AdjacentIncircles.shtml Equal Incircles Theorem] at [[cut-the-knot]]
* [https://www.cut-the-knot.org/Curriculum/Geometry/FourIncircles.shtml Five Incircles Theorem] at [[cut-the-knot]]
* [https://www.cut-the-knot.org/Curriculum/Geometry/IncirclesInQuadri.shtml Pairs of Incircles in a Quadrilateral] at [[cut-the-knot]]
* [https://web.archive.org/web/20151105214641/http://www.uff.br/trianglecenters/X0001.html An interactive Java applet for the incenter]

[[Category:Circles defined for a triangle]]