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Four horses are tethered at four corners...

Four horses are tethered at four corners of a square plot of side 63 m, so that they just cannot reach one another. The area left ungrazed is

A

`675.5 m^2`

B

`780.6 m^2`

C

`785.8 m^2`

D

`850.5 m^2`

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The correct Answer is:
D
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