Measure > Angle, Plane - Plane (3D Menu)

This command can be used to measure the angle between two 3D planes.

Any component face or construction plane can be identified as the first plane by clicking onto the component face or onto the construction plane's elliptical representation's outline.

Any component face or construction plane can be identified as the second plane by clicking onto the component face or onto the construction plane's elliptical representation's outline.