Manually Fix Reference Elements
It is always a good idea to "anchor" a part by manually constraining one or more elements from moving. This helps to give the software a frame of reference for automatically assigning constraints later on. For this example, fix the lowest horizontal and leftmost vertical construction lines in place with Refelem constraints to anchor the part.
1. Click Parametric and then, in the Create group, click Constraints.
The Generate Constraints dialog box opens.
2. In the Action area, click Assign.
3. In the Type box, select Refelem.
4. Click Apply.
5. Click the lowest horizontal construction line (collinear with the bottom edge of the plate).
6. Click the left-most vertical construction line (collinear with the left edge of the plate).
7. Click OK.
Notice the reference-element icons. The leader lines of these icons are dotted so that you know they are assigned to construction geometry and not to the edges of the triangular plate. Each constraint type has its own unique icon. See for a complete list of the constraint-type icons.
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