#line_roulette__roulette  a line generated by a point on one figure rolling around a second figure
  supertype:  curved_shape__curve  the trace of a point whose direction of motion changes
  subtype:  cycloid  a line generated by a point on a circle rolling along a straight line
     subtype:  curate_cycloid  a cycloid generated by a point inside the rolling circle
     subtype:  prolate_cycloid  a cycloid generated by a point outside the rolling circle
  subtype:  epicycloid  a line generated by a point on a circle rolling around another circle
     subtype:  cardioid  an epicycloid in which the rolling circle equals the fixed circle
  subtype:  hypocycloid  a line generated by a point on a circle that rolls around inside another circle

No statement uses or specializes line_roulette; click here to add one.