Four cows are tethered at four corners of a square plot of side 50m, so that they just cannot reach on another. What area will be left ungrazed?

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

Four horses are tethered at four corners of a square plot of side 63 metres so that they just cannot reach one another.The area left ungrazed is (a) 675.5m2 (b) 780.6m2 (c) 785.8m2 (d) 850.5m2

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 un grazed is :

Four cows a tethered at the four corners of a square field of side 50 m such that each can graze the maximum unshared area. What area will be left ungrazed ? [Take pi=3.14 ]