See section 12.12.9 for angle measures in three-dimensional geometry.
The angle command takes three mandatory arguments and one optional argument. The mandatory arguments are points A, B and C, which determine an angle BAC. The optional argument is a string.
angle returns the measure of the angle (in the units that
Xcas is configured for). If there is an
optional fourth argument, the angle will be drawn indicated by a small
arc and labeled with the string. If the angle is a right angle, the
indicator will be a corner rather than an arc.
Input:
Output:
Input:
Output:
Input:
Output:
Input:
Output:
Input:
Output:
The angle command has angleat and angleatraw versions (see section 11.14.1). For the command line versions of these commands, the optional fourth argument for angle is replaced by a mandatory fourth argument for the point to put the measurement.