Find the approx. area (in sq.m) that the goat can graze

A goat is tied to the corner of a rectangular plot, of dimensions 14m*7m, with a rope 21m long. Since there is a small wall constructed all along the plot, and the goat is tied outside the plot, it cannot graze inside the plot but can graze outside it, as far as the rope permits. Find the approx. area(in sq.m) that the goat can graze.
1)1080
2)1180
3)1232
4)1596

The Answer is 3)1232

The total area is = 0.75 ((22/7) * 21 * 21)
+ 0.25 ((22/7) * 14 * 14)
+ 0.25 ((22/7) * 7 * 7)

C) 1232. pretty easy