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Showing posts with label perimeter. Show all posts
Showing posts with label perimeter. Show all posts

Thursday, September 24, 2009

a b c sides of a triangle, perimeter less than 2

If $a,b,c$ are sides of a triangle whose perimeter is less than 2, prove that:

$\displaystyle \frac{(1+a)(1+b)(1+c)}{(1-a)(1-b)(1-c)} < \frac{(2+a+b+c)^2}{(2-(a+b+c))^2}$