- 16.025%
- 18.875%
- 19.625%
- 25%

Option 3 : 19.625%

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⇒ The sheep would be able to graze a piece of land in the shape of a quarter circle with a radius equal to the length of the rope.

⇒ Area of the field = 50 × 50 = 2500 sq.m

⇒ Area of the sector = 1/4 × π × r^{2} = 1/4 × π × 25^{2} = 1/4 × 3.14 × 625 = 490.625 sq.m

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