A B and CD are respectively arcs of two ...

A B and CD are respectively arcs of two concentric circles of radii 21 CM and 7cm which center O(see figure).If`/_=30^@` find the area of the shaded region. ( use`pi=22/7`)

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BEYOND PUBLICATION-TANGENTS AND SECANTS TO CIRCLE-EXERCISE

A B and CD are respectively arcs of two concentric circles of radii 21...
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