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leeminardi
en respuesta a: Slawek_Bielawa

Give the UCS command and then the ZA option (Z axis).  Click two point along one of the edges so that the z axis is collinear to it.

v1.JPG

Now give the plan command and you will be viewing the object down the z axis. You can add an angular dimension between any two lines each of which lies on one of the two planes to give you the valley angle. The angle will be determined for the current xy plane which is perpendicular to the two surfaces. 

 

v2.JPG

Note, I found a reference that defined the valley angle as the angle between the two surfaces.  This is different than the illustration you provided.

v3.JPG

lee.minardi