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On the Label or Dimension toolbar, select Symmetric Diameter.
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Select an element or key point. This element or key point is the origin.
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Select an element to measure or a key point to measure to.
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Move the pointer where you want to place the dimension. The dimension dynamically follows the movement of the pointer.
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Select to place the dimension.
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To place another dimension, select another element to measure or key point to measure to.
The origin element for this dimension is the first element or key point that you
selected.
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Select to place the dimension.
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To use a different origin element for additional dimensions, right-click to resume editing.
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After you select the two elements that you want to dimension between, the dimension changes depending on where you move the pointer.
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Turn on Half on the ribbon, and the dimensions appear as half. Turn off Half on the ribbon, and the dimensions appear as full.