### 27.5.2 Bisector plane in space

See Section 26.6.10 for perpendicular bisectors in the plane.

The perpen_bisector command finds the perpendicular bisector plane of a line segment.

- perpen_bisector takes seg, a line segment (or the end points of the segment).
- perpen_bisector(seg) returns and draws the perpendicular bisector plane of seg.

#### Example

perpen_bisector(point(0,0,0),point(4,4,4))

or:

perpen_bisector(segment([0,0,0],[4,4,4])