EntityQ20828394· pop 7· linked from 17 articlestangential triangleSign in to savetype of reference triangleConnectionsincircle and excircles of a triangleEntitycircumscribed circle for triangleEntitygeometryEntitytriangleEntityright triangleEntitytangentEntityvertexEntitynine-point circleEntityEuler lineEntityhomothetic transformationEntityaltitudeEntitytangential quadrilateralEntityorthocenterEntitycircles of ApolloniusEntitysymmedianEntityconcurrent linesEntitytangential polygonEntityLemoine pointEntityperspectiveEntityhomothetic centerEntityCategoriesObjects defined for a triangle