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On the corners of a square field of side $14$ metres, $4$ horses are tethered in such a way the adjacent horses just reach to each other. There is a circular pond of area $20$ sq. mt. in the centre of the square. What is the are left ungrazed?

1. $154$ sq. m
2. $22$ sq m
3. $120$ sq. m
4. None of these

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