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1961 IMO Problems/Problem 2

Revision as of 15:55, 6 April 2007 by Teki-Teki (talk | contribs)
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Let a,b, and c be the lengths of a triangle whose area is S. Prove that

$a^2 + b^2 + c^2 \ge 4S\sqrt{3}$

In what case does equality hold?

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