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Constraints defined in dialog box

I know this is a really silly question, but I cannot simple figure it out! I'm making a rectangle and then selecting left vertical, right vertical and then the top line in the rectangle. Thereafter I am pressing constraints defined in dialog box and ticking the box symmetry. However, when I do this all three line disappear and I am only left with the left vertical line. How come? Can someone please help me. This is my first catia assignment.
 

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I know this is a really silly question, but when I am making a rectangle in Catia, and marking the left vertical, the right vertical and the top sides and clicking Constraints defined in dialog box and symmetry all the lines disappear except the left vertical one. How come? Can someone please help me! This is my first Catia assignment. Thanks
 

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MrCATIA

Super Moderator
Ingvild,

I think you're picking the wrong centerline. Following the instructions attached, select the two vertical lines (A and B). For line C (the centerline), select the Vertical Axis (not the top line). This will make the the vertical lines symmetrical about the axis.
 

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