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11. Press Ctrl or Option (unless the “plus” sign is already there), move the mouse clockwise, and click to complete another 90-degree copy.

You should now have four total lines, with the two newest two lines selected. The top endpoint of the new lines is where the protractor will go next time.

12. So now repeat the previous steps: Ctrl + A or Cmd + A to select everything, activate Rotate, and place the protractor at the top endpoint of the copies lines.

13. Use the next two click to make a clockwise, 90-degree copy.