Circular Dimensions
To create a circular dimension and then rotate the dimension around the circle:
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Click Smart Dimension 
(Dimensions/Relations toolbar) or click Tools, Dimensions, Smart.
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Select the circle.
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Drag the dimension and click to place it.
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Set the value in the Modify box and click 
.
If the Modify box does not appear, either double-click the dimension or select Input dimension value in Tools, Options, General.
To change the placement of circular dimensions:
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Right-click the dimension.
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In the Dimension PropertyManager, select the Leaders tab.
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Under Witness/Leader Display, select a placement option.
For example:
You can also right click the dimension and select Display Options.
To modify the angle of linear dimensions:
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Click the dimension.
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Drag the handle on the text.
The dimension snaps to 15 degree increments.
