# TWO-DIMENSIONAL LOGICAL CONSTRAINTS

Logical constraints, unlike dimensions, do not have numeric parameters
and they are determined for geometric objects only. C3D Solver permits
to set the following logical constraints for geometric objects:
horizontality/verticality, coincidence, parallelism/perpendicularity,
tangency, equality of radii, etc.

```{toctree}

subsections/EN/Coincidence_of_a_Point_and_Other_Object
subsections/EN/Alignment_of_Points
subsections/EN/Parallelism_Perpendicularity
subsections/EN/Collinearity
subsections/EN/Equality_of_Lengths_and_Radii
subsections/EN/Unary_Constraints_Horizontality_Verticality_and_Fixing_Variants
subsections/EN/Length_Fixing
subsections/EN/Radius_Fixing
subsections/EN/Angular_Position_Constraint
subsections/EN/Tangency
subsections/EN/Multiple_and_End_Tangencies
subsections/EN/Mirror_Symmetry
subsections/EN/Bisector
subsections/EN/Middle_Point
subsections/EN/Mutual_Object_Positioning
```