EntityQ1365391· pop 6· linked from 2 articlesSoddy circleSign in to savegeometric conceptConnectionsincircle and excircles of a triangleEntityAlexander BogomolnyEntitycircumscribed circle for triangleEntitytriangleEntitydigital object identifierEntityFrederick SoddyEntityJSTOREntityQ118398EntityQ22908627Entitypolygonal chainEntityMathematical ReviewsEntityorthocenterEntityDescartes' theoremEntitysemiperimeterEntityÉmile LemoineEntityAmerican Mathematical MonthlyEntityDavid EppsteinEntityhomothetic centerEntityde Longchamps pointEntityForum GeometricorumEntityCategoriesCircle packingCircles defined for a triangle