April 22nd, 2011, 12:32 PM  #1 
Member Joined: Feb 2009 Posts: 54 Thanks: 0  Change of triangle height
Height if triangle is 32 while width is 24. The area doesn't change but the height is changing 3 meters per sec. Find out how fast does width change. I tried to do it but still don't understand the unit/time concept. Also I don't understand what is 
April 22nd, 2011, 12:43 PM  #2 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,205 Thanks: 512 Math Focus: Calculus/ODEs  Re: Change of triangle height
We have: Differentiating with respect to time, noting A is a constant, we have: We see that the base b (width) changes in the opposite direction of the height. With the values given, we find: 

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