All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Just Math
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    
No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)
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:
http://mathworld.wolfram.com/Quadrilateral.html

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

Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (8)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2024 by Animus Pactum Consulting. All rights reserved. Privacy Information