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25.10.9  Measure of an angle in space

See Section 24.13.4 for angle measures in two-dimensional geometry.

The angle command finds the measures of angles in space. It can take its arguments in three different ways.

  1. Three points.
  2. Two intersecting lines.
  3. A line and a plane.

Examples

angle(point(0,0,0),point(1,0,0),point(0,0,1))
     
1
2
 π
          
angle(line([0,0,0],[1,1,0]),line([0,0,0],[1,1,1]))
     
arccos


6
3



          
angle(line([0,0,0],[1,1,0]),plane(x+y+z=0))
     
arccos


6
3



          

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