About Measuring Angle
You can measure the angle only between two linear entities. Angle cannot be measured for nonlinear entities or between more than two entities. You can measure the following angle types:
Main angle
Supplementary angle (180º minus the main angle)
Conjugate angle (360º minus the main angle)
Second conjugate angle (360º minus the supplementary angle)
You can set the range within which to update an angle measurement in a saved analysis or feature if the model is redefined.