The dashed line can be moved left and right. F indicates the area of the blue shaded figure.

(a) Activate the check box "graphical representation" in the right graphics window and move the yellow point. What is displayed in the coordinate system? Compare this representation with your solution (see Triangle 1, task (c))![br][br](b) Solve by observing the graphical representation in the coordinate system:[br]• What happens when the dashed line reaches point C?[br]• What happens when the yellow dot is right of point B?