. "Ruler and the round; or, Angle trisection and circle division" . . "Angle trisection and circle division" . "Ruler and the round : or angle trisection and circle division" . . . . "Ruler and the round or, Angle trisection and circle division"@en . . . . . . "Ruler and the round or Angle trisection and circle division" . "Geometry Famous problems." . . "Geometry Famous problems" . . .