27.9.1  Circles in space

See Section 26.10.1 for circles in the plane.

The circle command returns and draws a circle. It can take its arguments in two different ways.

1. Three points.
   • circle takes three arguments: A,B,C, three points.
   • circle(A,B,C) returns and draws the circle in plane ABC with a diameter AB.
2. Two points and a vector.
   • circle takes three points:
     • C, a point (which can be given by its coordinates).
     • v, a vector.
     • A, a point (which can be given by its coordinates).
   • circle(C,v,A) returns and draws the circle in plane C(C+v)C with center C and containing C+v.

Examples