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Minimizing Perimeter (Posted on 2015-03-04) Difficulty: 2 of 5
Let ABC be a triangle with integral side lengths such that angle A=3 * angle B. Find the minimum value of its perimeter.

No Solution Yet Submitted by Danish Ahmed Khan    
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re(3): NO DICE.....not a spoiler | Comment 8 of 15 |
(In reply to re(2): NO DICE.....not a spoiler by Ady TZIDON)

I've never seen this formula: a+b+c= 2r*(sina+sin3a+sin4a)

but I looked it up.

r depends on a (as well as b and c)  So you can't just take the derivative of (sina+sin3a+sin4a)

Your error was assuming f was the only function that matters.

  Posted by Jer on 2015-03-04 12:28:11
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