Which command is typically used to establish symmetry in a sketch?

The command that is typically used to establish symmetry in a sketch is the symmetry constraint. This constraint allows you to define a line of symmetry, ensuring that the sketch entities on either side of that line mirror each other. When you apply the symmetry constraint, any modifications made to one side of the sketch will automatically reflect on the other side, maintaining the balanced proportion and geometric integrity necessary in design work. This is particularly useful for components that are designed to be symmetrical for aesthetic or functional reasons.

While options like the equal constraint, centerline command, and align command serve their purposes in sketching, they do not specifically focus on establishing symmetry in the way the symmetry constraint does. The equal constraint is used to ensure that two or more entities remain of equal length, which does not necessarily imply symmetry. The centerline command assists in constructing reference lines for various intents, including symmetry but isn't a direct way to enforce symmetry in the entities. The align command is typically used for aligning objects to one another rather than ensuring that they mirror across a defined line of symmetry. Thus, the symmetry constraint is distinctly designed for this purpose.