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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(2): Solution Comment 3 of 3 |
(In reply to re: Solution by Ady TZIDON)

Quadrilaterals with largest angle greater than 180 are
called concave or re-entrant quadrilaterals.
Check the following link:

  Posted by Praneeth on 2008-08-06 08:17:49

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