AB and CD are respectively arcs of two concentric circles of radii 21 cm and 7 cm and

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AB and CD are respectively arcs of two concentric circles of radii 21 cm and 7 cm and centre O (see the given figure). If ∠AOB = 30°, find the area of the shaded region.[ Use π = 22/7]

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Area of the shaded region = Area of sector OAEB − Area of sector OCFD