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Lines l and m are tangent to the circle ...

Lines l and m are tangent to the circle as shown. Segment AB is divided in the ratio `3:1` by point O `(AO>OB)`. The distance between the centres `C_1` and `C_2` is 20 cm. `/_AOD = 120^@`. The area of the shaded region is: a. `62.5 cm^2` b. `49.6 cm^2` c. `45.75 cm^2` d. `56.25 cm^2`

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