Choose Inspect tab→3D Measure group→Angle 
.
Using the Element Types box on the command bar, define the type of elements you want to use in the measurement.
Select an element to measure from.
Select a second element to measure to.
If you are measuring the angle between two keypoints, locate a third keypoint.
Tip:
At any time during the Measure Angle command, you can run a view manipulation command. When you exit the view command, the Measure Angle command continues at the previous state.
To measure in tight spots, you can zoom in on different areas of the part in different windows. You can measure between elements in any window.
In an assembly, you can activate inactive parts that you want to measure to by selecting the Activate button on the Measure Angle command bar and then selecting the part.
You can copy the measurement value to the Clipboard by highlighting the value and pressing Ctrl+C.