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Mirror 
Access: Invoke the Sketcher, define the sketch plane and then invoke this function from the following location:
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Click the Mirror button
in the Sketcher
toolbar.
Mirror selected entities about a line.
When you mirror a group of entities, all constraints and dimensions within the group are maintained.
Mirror one or more entities
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Click the Select option
from the Sketcher toolbar. Or press <exit><exit> until you are in Select mode.
The cursor will be a black pointer 
.
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Select the entity or entities you want to mirror. In this case, three lines and one circle are selected.
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Select the Mirror button
from the Sketcher toolbar, or select Mirror from the popup submenu. -
The cursor becomes a mirror-and-pointer symbol
. Now you must define the line of symmetry, either by selecting a line or by selecting two points. In this example two points are used, and the origin is chosen as the first point.
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Select the second point.
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The selected entities are mirrored about the symmetry line defined by the two points. You will return to Select mode.
Entities on both sides of the symmetry line are constrained to each other. Therefore, if you move the line shown below while in Select mode, the entities on both sides will update to maintain the 25.0 dimension and the tangental constraint.
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