Difference between revisions of "2009 IMO Problems/Problem 4"
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Revision as of 00:17, 19 November 2023
Problem
Let 
be a triangle with 
. The angle bisectors of 
and 
meet the sides 
and 
at 
and 
, respectively. Let 
be the incentre of triangle 
. Suppose that 
. Find all possible values of .
Authors: Jan Vonk and Peter Vandendriessche, Belgium, and Hojoo Lee, South Korea
Solution
This problem needs a solution. If you have a solution for it, please help us out by adding it.
See Also
| 2009 IMO (Problems) • Resources | ||
| Preceded by Problem 3 |
1 • 2 • 3 • 4 • 5 • 6 | Followed by Problem 5 |
| All IMO Problems and Solutions | ||
