To select multiple sketch entities, which key should you hold down while selecting?

To select multiple sketch entities in SolidWorks, holding down the Ctrl key allows you to select non-contiguous entities. This means you can choose different parts of the sketch without having to select them sequentially.

When the Ctrl key is pressed, each click adds to your selection, which can be very helpful when working with complex sketches where you want to pick multiple lines, arcs, circles, or other entities that are not directly connected. This functionality enables better control over sketches, making it easier to edit or manipulate certain parts of a design without affecting the entire sketch.

Other keys, like Shift or Alt, serve different purposes in selection processes. Shift, for instance, typically allows for selecting a range of contiguous entities, and Alt is often used for alternative actions rather than multiple selections. The Command key is specific to Mac systems and does not have the same functionality in this context. Thus, using the Ctrl key is the most effective method for multi-selection in SolidWorks sketching.