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 is the significance of the transparency of the paper in the rotation demonstration?

Explain the process of swapping coordinates and changing the sign of the Y coordinate during rotation.