Learning the quick way to rotate a point 90 degrees counter clockwise

The video tutorial demonstrates a simple trick using a scratch piece of paper to visualize point rotation, particularly a 90-degree counterclockwise rotation. The instructor explains how to use this method to determine the new position of a point after rotation. The mathematical concept of swapping coordinates and making the Y-coordinate negative is also discussed, providing a clear understanding of the rotation process.

What new insight or understanding did you gain from this video?