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A cow is tethered at A by a rope. Neither the rope nor the cow is allowed to enter the triangle $ABC$.

$m\angle A=30^{\circ}$
$1(AB)=1(AC)=10m.$
$1(BC)=6m$

What is the area that can be grazed by the cow if the length of the rope is 12 m?

  1. $133 1/6$ p sq.m
  2. $121$ p sq.m
  3. $132$ p sq.m
  4. $176/3$ p sq.m

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