Calculus optimization problem

  • Thread starter LHS
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  • #1
LHS
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Homework Statement



[PLAIN]http://img593.imageshack.us/img593/7536/unledci.png [Broken]

Homework Equations





The Attempt at a Solution



I called the wall b, half the roof a, and the angle theta.
I get Area=2ab*sin(theta/2)+1/2 a^2 sin(theta)... try differentiating with respect to a and theta then setting them to zero.. doesn't do much
 
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Answers and Replies

  • #2
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the question asks you to minimize perimeter (minus the base), not area. the area is fixed and so can be used to reduce the number of variables.
 
  • #3
LHS
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Oh I meant differentiate b with respect to a and theta. But yes, you are correct, silly me!
 

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