enables you to mirror one or more entities about a symmetry
line.The Mirror tool enables you to mirror one or more entities about a symmetry
line.
When you mirror a group of entities, all constraints and dimensions within the group are maintained.
To mirror one or more entities:
Click the Select
option 
from the Sketcher
toolbar. Or press exit
until you are in Select mode.
The cursor will be a black pointer 
.
Select the entity or entities you want to mirror. In this case, three lines and one circle are selected.
Select the Mirror
icon from the Sketcher toolbar, or select Mirror
from the popup menu.
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.
Select the second point.
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 tangency constraint.
