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A calf is tied with a rope of length 6 m at the corner of a square grassy lawn of side 20 m.

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A calf is tied with a rope of length 6 m at the corner of a square grassy lawn of side 20 m. If the length of the rope is increased by 5.5 m, find the increase in area of the grassy lawn in which the calf can graze.
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