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25.4.5  Parallel lines and planes in space

See Section 24.6.5 for parallel lines in the plane.

The parallel command can take its arguments in different ways. It returns and draws a line or plane depending on the arguments.

  1. With a point and a line.
  2. With two non-parallel lines.
  3. With a point and a plane.
  4. With a point and two non-parallel lines.

Examples

parallel(point(1,1,1),line(point(0,0,0),point(0,0,1)))
parallel(line(point(1,0,0),point(0,1,0)),line(point(0,0,0),point(0,0,1)))
parallel(point(0,0,0),plane(point(1,0,0),point(0,1,0),point(0,0,1)))
parallel(point(1,1,1),line(point(0,0,0),point(0,0,1)), line(point(1,0,0),point(0,1,0)))

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