EntityQ19598677· pop 7· linked from 11 articlespolar circleSign in to savecircle in triangle geometryConnectionsaltitudeEntitycircumscribed circle for triangleEntitygeometryEntitytriangleEntitytrigonometryEntitycircleEntityangleEntityvertexEntitycircumscribed circleEntityEuler lineEntitynine-point circleEntityMathWorldEntityEric W. WeissteinEntityorthocenterEntitycircles of ApolloniusEntitypole and polarEntityacute or obtuse triangleEntityorthocentric systemEntitycomplete quadrangleEntitynine-point centerEntityCategoriesCircles defined for a triangle