the diagram, AB and CD are arcs of two concentric circles with centre O. OA - 10 cm and AC = 5 cm and angle AOB = 0 radians. 5. (a) Given that the perimeter of the region ABCD is 40 cm, show that 0 = 1.2. b) Find the area of the region ABCD. Answer : 0 = 1.2 shown [3

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