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Other Dimensions

Several other dimensioning types are worth mentioning. These dimension types are not linear and serve specific purposes. Depending on your discipline, you may have a use for some of these types. For example, a mechanical part designer will make heavy use of radius and diameter dimension types, whereas a civil engineer will make use of datum dimension types.

Radius and Diameter Dimensions

Radius and diameter dimensions are used to dimension the size of an arc or circle, regardless of the type of object. If you create a polyline with an arc in it, for example, you can use either dimension type to dimension the arc. If you select the Center Mark check box in the Dimension Styles dialog box, the center mark will automatically be used with radius and diameter dimensions when the dimension text is placed outside the circle or arc. Other than that, the placement of radius and diameter dimensions is relatively straightforward. With these dimension types, you simply pick the arc or circle to dimension, then the dimension line location. Features of the Dimension Style dialog box will be presented in Chapter 18.


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