25. The increased area of the grassy lawn

A calf is tied with a rope of length 10 \(m\) at the corner of a square grassy lawn of side 27 \(m\). If the length of the rope is increased by 3 \(m\), find the increase in area of the grassy lawn in which the calf can graze.

 

The increased area of the grassy lawn is 54.656.355.454.2 \(m^2\).