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- anonimnystefy
- 2012-11-06 01:43:35
You are welcome!
- Agnishom
- 2012-11-06 01:40:53
Yes! 
Thanks to bob bundy and anonimnystefy
- anonimnystefy
- 2012-11-06 00:39:44
You can do it like this:
CD<AC+AD<(AB+BC)+AD. Q.E.D
- Agnishom
- 2012-11-06 00:25:36
Tried...But how do I get rid of the diagonal in the equation?
- bob bundy
- 2012-11-06 00:14:37
hi
Split your quadrilateral into two triangles and use the triangle inequality twice.
Bob
- Agnishom
- 2012-11-06 00:07:11
Prove that in a quadrilateral ABCD,
AB + BC + CD > DA