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Color
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By default, model dimensions are black. This includes dimensions that are blue in the part or assembly document (such as the extrusion depth). Reference dimensions are gray and appear with parentheses by default. You can specify colors for various types of dimensions in and specify Add parentheses by default in .
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Arrows
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Circular handles appear on dimension arrows when dimensions are selected. When you click on an arrowhead handle (on either handle if there are two for the dimension), the arrows flip outside or inside. When you right-click on a handle, a list of arrowhead styles appears. You can change the style of any dimension arrowhead individually by this method.
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| Flipping the arrows |
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| Changing the arrowhead style |
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Hide and Show Lines
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To hide a dimension line or extension line, right-click the line and select Hide Dimension Line or Hide Extension Line. To show hidden lines, right-click the dimension or a visible line and select Show Dimension Lines or Show Extension Lines
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Radius and Diameter Displays
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You can change a dimension to diameter, radius, or linear display. On screen, right-click a radius or diameter dimension and select:
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| Display As Diameter. This example is shown without the second arrow. Click Use document second arrow to display both arrows. |
Display As Radius |
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| Display as Linear. Sets the dimension to linear style (for diameter dimensions only.) |
You can right-click and select the above options only when you first create the dimension. If you edit the dimension later on, right-click the dimension and select Display Options, then select an option above.
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Slant
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When you insert or select dimensions, handles appear so you can drag the dimension to slant the extension lines. 
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Selection
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You can select dimensions by clicking anywhere on the dimension, including dimension and extension lines and arrows.
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Hide and Show Dimensions
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You can hide and show dimensions with Hide/Show Annotations  on the Annotation toolbar or View menu. You can also right-click a dimension and select Hide to hide the dimension. You can also hide and show dimensions in annotation views. To show dimension names, click or (Heads-Up View toolbar).
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