9. The increased area of the grassy lawn

A calf is tied with a rope of length 8 \(m\) at the corner of a square grassy lawn of side 28 \(m\). If the length of the rope is increased by 2.6 \(m\), find the increase in area of the grassy lawn in which the calf can graze.

 

The increased area of the grassy lawn is 38.440.13839.2 \(m^2\).