How to determine the points of a triangle rotated 90 degrees counter clockwise

The video tutorial explains the concept of rotating a triangle around a fixed point, specifically focusing on counterclockwise rotations about the origin. It introduces the rule for 90-degree counterclockwise rotations, which involves swapping coordinates and making the first coordinate negative. The tutorial demonstrates this rule with specific coordinates, transforming them into new positions after rotation.

Explain the significance of the fixed point in rotations.

What is the rule for rotating a point 90 degrees counterclockwise?

Describe the process of reflecting points over the line X = Y.

How do you determine the new coordinates of a point after a 90-degree counterclockwise rotation?

What are the new coordinates of point L after the rotation?