You will need to know how to find the magnitude (length) of a vector as it can be used for finding the distance between two points as shown in the video.

### Example:

- Find the distance AB, where A(3, -5, 6) and B (4, 1, 3).

You will need to know how to find the magnitude (length) of a vector as it can be used for finding the distance between two points as shown in the video.

- Find the distance AB, where A(3, -5, 6) and B (4, 1, 3).