What Is a Constraint?
A constraint is a kind of relationship that allows specifying the geometry. In other
words, if you modify the geometry afterwards via the geometry itself, these relations
will be taken into account.
Two kinds of constraint can be applied.
 | geometrical constraints
A relationship that forces a limitation between one or more geometrical elements. |
| dimensional constraints
A constraint the value
of which limits the geometry. |
Geometrical Constraints |
Dimensional Constraints |
| support lines and circles |
distance |
| alignment |
length |
| parallelism |
angle |
| perpendicularity |
radius/diameter |
| tangency |
|
| concentricity |
|
| horizontality |
|
| verticality |
|
| fix |
|
| middle point |
|
| equidistant point |
|
| symmetrical |
|
What Does Creating Constraints Mean?
|
You can create constraints using the Tools toolbar:
| Explicitly, via the existing Show Constraints command  (detected
constraints). |
| Via a dimension that you make to be the driving constraint. |
| Via Autodetection, if you activate the Create Detected Constraints command  to automatically create detected constraints. |
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