Angle measurement
To measure an angle in a 2D or a 3D viewer:
Click Measure in the menu bar.
Click Angle 
.
Click a first, second and third point.
Note
Right-click or click outside the workspace to cancel.
The angle measurement is shown in the viewer and added to the Annotation tab 
on the smart panel under the group of Measurements or 2D measurements depending on whether it is a 3D or 2D angle measurement.
Editing the angle measurement
To edit the angle measurement, drag the control points. The value is updated accordingly.
To move the label of the angle measurement, drag it.
Deleting the angle measurement
To delete the angle measurement, select the angle measurement object in the viewer, and press the Delete key.