At what rate, in cm/s, is the radius of the circle increasing when the radius is 5 cm if oil is poured on a flat surface, and it spreads out forming a circle and the area of this circle is increasing at a constant rate of 5 cm2/s?
1 Answer
Feb 26, 2015
You can think that both your area
deriving you get that your area changes and your radius changes as:
But:
Considering the instant when
and finally the rate of change of your radius will be: