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A cow is tethered at point `A` by a rope. Neither the rope nor the cow is allowed to enter the triangle `A B C`. `/_B A C=30^@`, `A B=A C=10 m`. (a) `(133\ pi)/6\ sq\ m` (b) `121\ pi\ sq\ m` (c) `132\ pi\ sq\ m` (d) `(176\ pi)/3\ sq\ m`

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