AutoCAD 2010 – First Look at Parametric Constraints
New to AutoCAD 2010 Parametric Constraints allow you to make AutoCAD objects preserve geometric and dimensional relationships.
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Parametric Constraints in AutoCAD 2010: Practical CAD blocks
Parametric Constraints in AutoCAD 2010: Practical CAD blocks rewritten as a practical guide for architects, designers, and drafters building reusable draw