SolidWorks | Challenge 29

This is the 29th 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. What is a slot?
2. What are the parameters to make a plane at an angle?
3. Is it always necessary to select a plane to use the mirror command?