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What is the viewport scale of the viewport which has had it's view rotated to world co-ordinates?
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The PLAN command will rotate the view of a drawing with options to use current or world.
Do this in model space to see the view of the drawing rotated to world co-ordinates.
Go to the layout tab and ensure that you are in Paper space. (You should see the triangle UCS). Click on the edge of the appropriate viewport. Right mouse to properties and read off the viewport scale.
Avoid the temptation to double click inside the viewport. This action could change it's scale with an accidental mouse wheel rotation.