True or False: You can select a planar face as the reference plane for mirroring a feature?

When mirroring a feature in SolidWorks, you can indeed select a planar face as the reference plane. Selecting a planar face allows for precise and accurate mirroring of features, as it serves as a clear geometric reference. This capability is fundamental in many design scenarios where symmetry or duplication of features across a plane is required.

All planar faces, whether they are part of a part or assembly, can act as effective reference planes. This versatility enhances the modeling workflow, allowing designers to efficiently create mirrored features without needing to create additional reference planes. Utilizing existing planar faces helps in maintaining the design intent and ensuring accuracy in the mirrored features.

In contrast, the other options imply limitations that do not exist in SolidWorks. For example, the assertion that mirroring is only possible in assembly mode or limited to sketches doesn’t hold true, as the functionality is available in part modeling as well. Thus, the correct answer reflects the fundamental capabilities of SolidWorks concerning the mirroring of features relative to any planar face.