EntityQ96375449· pop 9· linked from 2 articlesConway circleSign in to savegeometrical construction based on extending the sides of a triangleConnectionsincircle and excircles of a triangleEntitytriangleEntitycircleEntityEuclidean geometryEntityline segmentEntitycongruenceEntityvertexEntityJohn Horton ConwayEntityMathWorldEntityEric W. WeissteinEntityconcentricEntityincenterEntityTangent lines to circlesEntityClark KimberlingEntityCategoriesJohn Horton ConwayTheorems about triangles and circles