Dimensions Between
Arcs or Circles
By default, distances are measured to the center of an arc or circle.
With the Smart Dimension 
tool, you can create:
To dimension between the edges of two
arcs:
Click Smart Dimension
(Dimensions/Relations toolbar) or Tools,
Dimensions, Smart. Select the edge of the first arc, and then select
the edge of the second arc. Press Shift,
and then click to apply the dimension between the two edges.
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To change the way the distance is measured:
Click the dimension between arcs.
To display both First
arc condition and Second arc condition
in the Dimension PropertyManager,
select the edges of both arcs with the Smart
Dimension tool.
In the Dimension
PropertyManager, select the Leaders
tab.
Under Arc Condition:
Set a value for First
arc condition.
Set a value for Second
arc condition.
Click 
.
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First arc condition |
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Second arc condition |
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Center
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Center |
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Min |
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Max |
To dimension between concentric circles and display
extension lines:
In an open
sketch, click Smart Dimension
(Dimensions/Relations
toolbar) or Tools, Dimensions,
Smart. Click the
edge of one concentric circle, then click the edge of the second concentric
circle. Click to
place the dimension. Click .
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To display extension lines after placing the dimension:
Right-click the dimension and select Display Options, Show
extension lines.
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You can also drag extension lines to new
attachment points and change the position of radial dimensions.