Four horses are tethered at four corners of a square plot of 42 m so that they just cannot reach one another. The area left ungrazed is:

Four horses are tethered at four corners of a square plot of 42 m so t

1.	Four horses are tethered at four corners of a square plot of 42 m so that they just cannot reach one another. The area left ungrazed is:
A.	\[378\,{{m}^{2}}\]
B.	\[438\,{{m}^{2}}\]
C.	\[786\,{{m}^{2}}\]
D.	None of these
Answer» B. \[438\,{{m}^{2}}\]

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Four horses are tethered at four corners of a square plot of 42 m so that they just cannot reach one another. The area left ungrazed is:

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