1.

AB and CD are respectively arcs of two concentric circles of radii 21 cm and 7 cm and centre O. If ∠AOB=30∘, find the area of the shaded region.

Answer»

AB and CD are respectively arcs of two concentric circles of radii 21 cm and 7 cm and centre O. If AOB=30, find the area of the shaded region.




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