[list=1][*]Can you find angles in this situation?[/*][*]If you increase the blue angle, what is happening to the green angle?[/*][*]If you double the blue angle, what is happening to the green angle?[/*][*]If you cut the blue angle into half, what is happening to the green angle?[/*][*]Compare the opening of the fan with the measure of the blue angle.[/*][*]Compare the opening of the fan with the opening of the green angle.[/*][*]How do you know?[/*][/list]