In summer, a small squirrel was seen by two students walking around the UBC water fountain, suddenly it jumped into it to refresh a little bit because of the heat.

Surprisingly the squirrel made such a big jump that it could reach the exactly middle point of the fountain. When it happened, wave circles started to form and its radius also started to increase with time.

Assuming that the fountain has 6 m of diameter and when   the first circle wave had a radius of 2 m, it was changing at a rate of 50 cm/s,the two students who saw the squirrel wanted to know how fast the area of this first circle wave increased over the same time.