You can place the following types of dimensions with SmartDimension:
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Linear dimension
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Angular dimension
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Radial dimension
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Diameter dimension
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On the Label or Dimension toolbar, click SmartDimension .
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Click an element.
The command determines the type of dimension to place, depending on the type of element you select, and displays the dimension dynamically so you can position it.
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Position the dimension, and then click a point to place it.
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SmartDimension automatically determines the type of dimension to place based on the element that you select, such as linear, radial, or angular. However, you can specify a different dimension type. For example, if you click SmartDimension and then select a circle, by default Diameter is the active dimension type on the Dimension ribbon; you then place a diameter dimension. However, if you want to place a radial dimension instead, you can click Radius on the ribbon and then place the dimension.
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To place a driving dimension, you must set Maintain Relationships on the Tools menu, select an element, and then click a dimension command on the Label or Dimension toolbar; the dimension that you place is a driving dimension by default.
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You can change a dimension to driving or driven by selecting it and then clicking Driving/Driven on the ribbon.
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To place a horizontal or vertical dimension between the end points of an angular line, you must press SHIFT.
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A connector is not considered to be a geometric element; consequently, it cannot be dimensioned.