SolidWorks | Challenge 13

This is the 13th exercise of the 30 Days Solidworks Challenge.
In the next coming days, you will learn all Solidworks 2D and 3D tools that are required for you to start with SolidWorks.

Here is the quiz question for this video, Answer it in the comment section.
1.How we used the reference plane?
2.How we mirror the sketch?
3.What is the basic need to use the mirror command