Pippa is designing a new label for a drink bottle. The design is made up of two circles placed one on top of the other as shown in the diagram. The maximum height of the two circles is to be 10 cm. The minimum diameter of either circle is 2 cm (radius is at least 1 cm). The bottom circle is coloured red and the top one blue. She wants to know the approximate area of each circle. Remember A = π r 2 . Pippa uses π as 3 . Give the general equation of the graph which represents the total of the areas of the red and blue circles, where the sum of their radii is n cm. Input note: Let r be the radius of the red circle.