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Forum URL: http://www.cut-the-knot.org/cgi-bin/dcforum/forumctk.cgi
Forum Name: College math
Topic ID: 652
Message ID: 0
#0, Semiperimeter and Circumradius Inequality
Posted by Bractals on Oct-14-07 at 01:49 PM
I have checked this out with Sketchpad, but I'm stumped on how to prove it.

For an acute triangle, s > 2R.

Any help will be greatly appreciated.