# Parametric Constraints [GstarCAD 2021](Help%20System/GSTARCAD/2021/Index.md) → [User Guide](Help%20System/GSTARCAD/2021/User%20Guide/(User%20Guide).md) → [Additional Pages](Help%20System/GSTARCAD/2021/User%20Guide/Additional%20Pages/(Additional%20Pages).md) ## **Parametric Constraints** Parametric constraints are a great new feature introduced by GstarCAD, to add more value for a better design concept. Used for 2D geometry, Parametric constraints represent a set of rules (associations and restrictions). They include Geometric and Dimensional constraints, which help to retain a drawing's design intent and requirements. - [Geometric constraints](Help%20System/GSTARCAD/2021/User%20Guide/Additional%20Pages/Geometric%20Constraint.md)control the relationships of objects with respect to each other - *[Dimensional constraints](Help%20System/GSTARCAD/2021/User%20Guide/Additional%20Pages/Dimensional%20Constraint.md)*control the distance, length, angle and radius values of objects Geometric and dimensional constraints using the default format and visibility are shown in the following drawing.  Every time you hover the cursor over an object with constraints, a blue cursor icon will be displayed. Constraints offer the means to enforce requirements when you experiment with different designs or make changes to a drawing. When objects are modified, other objects will change automatically and changes to distance and angle values will be limited. With constraints, you can: - Constrain the geometry within a drawing to maintain design specifications and requirements. - Multiple geometric constraints can be applied to objects at once - Include formulas and equations within dimensional constraints - Cchange the value of a variable to achieve quick design changes Click on the links below to see: [Geometric Constraints](Help%20System/GSTARCAD/2021/User%20Guide/Additional%20Pages/Geometric%20Constraint.md) [Dimensional Contraints](Help%20System/GSTARCAD/2021/User%20Guide/Additional%20Pages/Dimensional%20Constraint.md) Gstarsoft Co.,Ltd ## Other versions with matching text [GstarCAD 2017](../../../2017/User%20Guide/Additional%20Pages/Parametric%20Constraints.md) · [GstarCAD 2018](Help%20System/GSTARCAD/2018/User%20Guide/Additional%20Pages/Parametric%20Constraints.md) · [GstarCAD 2019](Help%20System/GSTARCAD/2019/User%20Guide/Additional%20Pages/Parametric%20Constraints.md) · [GstarCAD 2020](Help%20System/GSTARCAD/2020/User%20Guide/Additional%20Pages/Parametric%20Constraints.md)