It's going to be square centimeters, centimeters times centimeters, square centimeter per second, which is the exact units we need for a change in area. So we have da dt is equal to this. The rate at which area is changing with respect to time is equal to 6 pi. So it's going to be a little bit over 18 centimeters squared per second, right at that moment. Yep, 3 times 2 pi. So 6 pi centimeters squared per second is how fast the area is changing. And we are done.