EntityQ451581· pop 7· linked from 12 articlesSpieker circleSign in to savegeometric objectConnectionsincircle and excircles of a triangleEntityAlbert EinsteinPersongeometryEntityPotsdamEntitytangentEntitycenter of massEntitycircumscribed circleEntitynine-point circleEntityEuler lineEntityaltitudeEntitycentroidEntitymidpointEntityorthocenterEntityNagel pointEntityincenterEntitydualityEntityconcurrent linesEntitymedial triangleEntitySpieker centerEntitypower centerEntityCategoriesCircles defined for a triangle