# The exterior angle bisector: exbisector

### 13.7.12 The exterior angle bisector: exbisector

The exbisector command finds exterior angle bisectors.

- exbisector takes three arguments:
  a,b,c, three points (which can also be given as a list).
- exbisector(a,b,c) returns and draws the bisector of the exterior angle of the triangle determined by a,b and c; a is the vertex of the angle, the opposite of the ray through a and b determine one side of the angle and a and c determine the second side.

#### Example.

Input:

exbisector(0,1,i)

Output: