### 3.5.3 The units for angles

By default, Xcas will assume that any angles you give (for
example, as the argument to a trigonometric function) is being
measured in radians. If you want, you can have Xcas use
degrees.

You can set which angle measure Xcas uses in the CAS
configuration screen (see subsection 3.5.7).
Your choice will be stored in the variable
angle_radian; this will be 1 if you measure your
angles in radians and 0 if you measure your angles in
degrees. You can also change which angle measure you use by setting
the variable angle_radian to the appropriate value. The
angle measure you want to use will be stored in the configuration file
(see subsection 3.5.10), and so can also be set there.