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Quadrilateral Sine Inequality (Posted on 2008-08-05) Difficulty: 3 of 5
Let A,B,C and D be angles in a quadrilateral. Prove that:

(CSinASinB)+(ASinCSinD)+(D|CosACosB|)+(B|CosCCosD|)    2(pi)

No Solution Yet Submitted by Jonathan Lindgren    
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re: Solution | Comment 2 of 3 |
(In reply to Solution by Praneeth)


You say:

You forgot to consider the case where the largest angle is
greater than 180.

I say:   the largest angle is  N E V E R
greater than 180.

  Posted by Ady TZIDON on 2008-08-06 08:06:51
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