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Click Tools > Measure to display the Measure Ribbon.
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Click Measure Angle Between 3 Points .
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Place the three points in the model.
The angle between the points appears next to the pointer.
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Right-click to quit the Measure command.
When you measure an angle, the Angle and Apparent angle boxes display on the ribbon. The Apparent angle box displays the angle of the lines projected onto the active view plane. If lines intersect (coplanar), then both the Angle and Apparent angle boxes display values. If lines do not intersect (are not coplanar), then only the Apparent angle box displays a value.