So we have a centimeter times a centimeter. So it's going to be centimeters. That's too dark of a color. 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.