MARKED RULER AS A TOOL FOR GEOMETRIC CONSTRUCTIONS--FROM ANGLE TRISECTION TO N-SIDED POLYGONFURTHER INVESTIGATION ON BUFFON'S NEEDLE PROBLEMGHOST LEGTHE PRODUCT OF CONSECUTIVE INTEGERS IS NEVER A SQUAREILLUMINATION PROBLEMDECONSTRUCTING KAFKABEST POSITIONS FOR INSTALLING LIFTS IN A SHOPPING MALLPERIMETER OF ELLIPSE AND GENERALIZATION IN N-DIMENSIONAL CASETHE CONSTRUCTION OF SOUTH-WESTERN HONG KONG ISLAND LINE · · · · · · (收起)