Graph ABC after a rotation of 270° clockwise about the origin. Select the "Polygon" button and plot your three points. You click on your first point to complete the triangle.

After a rotation of 270° clockwise about the origin, the new coordinates of our points would be:

A' = (1, -2)
B' = (2, -4)
C' = (5, -3)

Plotting these new points on a graph and connecting them forms a new triangle.