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 tool does the teacher suggest using to help visualize rotations during tests?

• A calculator

• A scratch piece of paper

• A protractor

• A ruler

What is the direction of rotation discussed in the video?

• Upward

• Downward

• Counterclockwise

• Clockwise

What is the purpose of using a scratch piece of paper in the rotation trick?

• To visualize the new position of a point

• To write down calculations

• To cover the screen

• To draw a graph

When rotating a point 90 degrees counterclockwise, what should you do with the coordinates?

• Swap the coordinates and make the X negative

• Only change the X coordinate

• Swap the coordinates and make the Y negative

• Keep the coordinates the same

What is the result of a 90-degree counterclockwise rotation on a point (X, Y)?

• (X, -Y)

• (-Y, X)

• (-Y, -X)

• (Y, X)