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Here the 4 cows are tethered to each corner implies or means that the area available for grazing is a quadrant of radius 25 m with central angle as 60 degrees as the field is in shape of square . Now we need to find the area of this sector to find out the area available for grazing for all the cows and then subtract it from the total area of the square field to obtain the area left ungrazed.

The reason why we have taken the radius as 25 m is , basically we have considered that each cow is tethered to a rope which is equal to half of the side of the square as we had to maximize the area each cow gets to graze without sharing thus the maximum radius within which a cow can graze maximum unshared area is simply the half of the side of square.

Given the side of field which is in shape of square = a = 50 m

Area of the field = Area of Square

Area of field = a2

Area of field = (502)

Area of field = 2500 m2

We know in an square all the angles are 90 degrees.

Area available for grazing for one cow = area of sector/quadrant

Where R = radius of circle & θ = central angle of sector

Given R = 25 m & θ = 90°

Put the given values in the above equation,

Area available for grazing for one cow = 490.625 m2

Area available for 4 cows = 4 × Area available for one cow

Area available for 4 cows = 4 × 490.625

Area available for 4 cows = 1962.5 m2

Area left ungrazed = Area of field – Area available for grazing for 4 cows

Area that cannot be grazed = 2500 – 1962.5

Area that cannot be grazed = 537.5 m2

The area left ungrazed is 537.5 m2.

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