# About Modifying Geometrically Constrained Objects

You can edit geometrically constrained objects using grips, editing commands, or by

relaxing or applying geometric constraints.

By definition, geometric constraints that are applied to geometric objects limit

the editing actions that you perform on the objects.

## Modify Constrained Objects with Grips

You can modify constrained geometry using grip editing modes. The geometry will maintain

all applied constraints.

For example, if a line object is constrained to remain tangent to a circle, you can

rotate the line and change its length and endpoints, but the line *or its extension* will remain tangent to the circle.

If the circle was an arc instead, the line *or its extension* would remain tangent to the arc *or its extension*.

The results of modifying underconstrained objects are based on what constraints have

already been applied and the object types involved. For example, if the Radius constraint

had not been applied, the radius of the circle would have been modified instead of

the tangent point of the line.

The CONSTRAINTSOLVEMODE system variable determines the way an object behaves when

constraints are applied or when grips are used to edit it.

You can limit unexpected changes by applying additional geometric or dimensional constraints

such as coincident and fix constraints.

## Modify Constrained Objects

You can use commands such as MOVE, COPY, ROTATE, SCALE, and STRETCH to modify constrained

geometry while maintaining the constraints applied to the objects. Commands such as

TRIM, EXTEND, BREAK, and JOIN can remove constraints in some circumstances.

constraints applied to the original objects will also be duplicated. This behavior

is controlled by the PARAMETERCOPYMODE system variable. Using the copying technique,

you can save work by taking advantage of multiple instances of objects, bilateral

symmetry, or radial symmetry. This feature is not available in AutoCAD LT.

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