[obm-l] desigualdade geometrica

To: obm-l@xxxxxxxxxxxxxx
Subject: [obm-l] desigualdade geometrica
From: vinicius aleixo <viniciusaleixo@xxxxxxxxxxxx>
Date: Sun, 22 Jan 2006 20:24:02 -0300 (ART)
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Demonstre que:

a² + b² + c² ¡Ý 4¡Ì3 A , onde A ¨¦ a ¨¢rea do triang. de lados a,b,c.