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Select Angle from Plane .
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In the model or Workspace Explorer, select the base plane from which to angle the slab that you are defining.
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Select a rotation axis. The rotation axis can be a grid line or a member edge. However, the rotation axis that you select must be parallel to the surface of the plane selected in step 2.
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In the Angle box, specify the rotation angle of the slab relative to the selected base plane.