How do you make a quarter turn clockwise using a grid?

To make a quarter turn clockwise on a grid, you rotate an object or point 90 degrees to the right. If you're working with coordinates, for a point (x, y), the new coordinates after the rotation will be (y, -x). This means that the x-coordinate becomes the y-coordinate, and the y-coordinate becomes the negative x-coordinate. Visualizing this on the grid can help you see how the point shifts position.