As a circular griddle is being heated, its diameter changes at a rate of 0.01 cm/min. When the diameter is 30 cm, at what rate is the area of the griddle changing?
I know my formula is V=PI*r^2
and i know since i am given a diameter i would use (h/2) for my radius.
but once i take my derivative of the area formula and plug in my diameter and my DD/DR as .01 cm/min, i am given .942...
the answer is .471
what am i doing wrong?
it was so obvious lol thanks man
Originally Posted by Jhevon