In the diagram, three circles with respective centres A, B and C, touch one another. The radii of the circles are 3 cm, 2 cm and 1 cm respectively. (a) Show that ZACB = radians. (b) Find the perimeter of the shaded region. (c) Find the area of the shaded region. 3107 A 3 3 usil ont le 2 B 2 1 C

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