Note: If one of the circles / arcs is not in the current sketch, you must add it to the sketch as a reference entity.
Select the
Dimension
option
.
Click two circles/arcs. (The order of selection does not matter.) Select the side of each circle/arc from which you want the dimension to be measured.
Click one side of the first circle/arc.

Click one side of the second circle/arc.

The dimension that will be displayed measures the distance between the two selected sides.
Click the location where you want the dimension to appear.

In the Dimension dialog, adjust the dimension value if required. For example, adjust upwards to 10.
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Click anywhere to define the dimension (or click exit or press Enter).

Note: When applying dimensions, you can work in Automatic Preview or Manual Preview.