ConceptAreas of Combinations of Plane Figures

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#### Question

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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#### Reference Material

Solution for concept: Areas of Combinations of Plane Figures. For the course CBSE