A B and C D are respectively arcs of ...

`A B` and `C D` are respectively arcs of two concentric circles of radii 21 cm and 7 cm and centre `O` . If `/_A O B=30o` , find the area of the shaded region.

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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 figwe). If AOB = 30°, find the area of the shaded region.

AB and CD are respectively arcs of two concentric circles of radii 21cm and 7cm and centre O (see Fig.12.32). If /_AOB=30^(@) find the area of the shaded region.

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