A spherical snowball is placed in the sun. The snowball melts so that it's surface area

decreases at a rate of 2 cm2
/min. Find the rate at which the diameter decreases when the
diameter is 8 cm.

I'm not sure what formulas to use, SA and/or Volume. And im not sure how to calculate it.

1 answer

who cares about the volume?

A = πd^2
dA/dt = 2πd dd/dt

Now plug in your numbers to find dd/dt