10.1 The general idea
  10.1.1 The parabola as a locus
 10.2 Locus surfaces in ³
  10.2.1 Tracing a point on a plane
  10.2.2 Trace a point that depends on two base points on lines, segments or circles
  10.2.3 Tracing a circle, line or segment that depends on a point on a linear object
 10.3 Tracing a point that depends on a point on a sphere