Oil is leaking in a circular shape from a tanker in such a way that the radius of the circular spill is increasing at the rate of $2\mathrm{.}5$ ft per hour. To manage the spill, the oil company needs to know the rate at which the area covered by oil is increasing. Find the rate at which the area is increasing at the time that the radius of the spill is $650$ ft $.$ Approximate $$ by $3\mathrm{.}14.$