- Cory Ulrich
What angle will you need to rotate the red triangle so it matches up with the blue triangle?
Drag the sliders and Point E. Use the "show circles" button to see the circles that the blue triangle rotates around. Think about: a) does the center point change the ORIENTATION of the blue triangle? b) what OTHER transformations (reflection, translation) could you use to help map the red triangle to the blue triangle if you wanted to rotate around the origin only?