1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Related rate problem

  1. Dec 23, 2003 #1
    What is the radius when the area in square units of an expanding circle is increasing twice as fast as the radius?
  2. jcsd
  3. Dec 23, 2003 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Start with the area of a circle (A = πr2) and take the derivative with respect to time. Then apply what's given.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook