Select Dimension
in the Annotations toolbar (Dimensions sub-toolbar).
Move the cursor over the spline. You can notice that
the cursor changes to indicate that you are going to create a dimension
on a spline.

On the spline, click the point where you want to create
the curvature radius dimension. A preview of the curvature radius dimension
is displayed.
Click to validate the dimension creation.

Move the dimension over the spline to modify the dimension.

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