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Acute triangle, Trigonometric function! (Posted on 2007-10-13) Difficulty: 3 of 5
Prove that in an acute triangle sin(A) + sin(B) + sin(C) > 2

See The Solution Submitted by Chesca Ciprian    
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Hints/Tips Hint | Comment 3 of 9 |
If the semiperimeter of an acute triangle is greater than the diameter of its circumcircle, then sin(A) + sin(B) + sin(C) > 2 follows from the rule of sines.
  Posted by Bractals on 2007-10-13 19:41:08
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