fallen_6666 Posted November 5, 2005 Share Posted November 5, 2005 Could someone help me with this question? The base of an isosceles triangle is 6 m. The other two sides are both increasing at 4m/s. Find the rate of increase of the area of the triangle when these sides are 5 m. Link to comment Share on other sites More sharing options...
BigMoosie Posted November 5, 2005 Share Posted November 5, 2005 My answer is [math]15m^2s^{-1}[/math]: Base = 6 Side = 4t Height = [math]\sqrt{16t^2-9}[/math] Area = [math]f(t) = 3 (16t^2-9)^{0.5}[/math] [math]f'(t) = 48t ( 16t^2 - 9)^{-0.5}[/math] f'(1.25) = 15 Link to comment Share on other sites More sharing options...
fallen_6666 Posted November 5, 2005 Author Share Posted November 5, 2005 Thank you so much. Link to comment Share on other sites More sharing options...
BigMoosie Posted November 5, 2005 Share Posted November 5, 2005 No problem Link to comment Share on other sites More sharing options...
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