2011 USAMO Problems/Problem 3
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In hexagon 
, which is nonconvex but not self-intersecting, no pair of opposite sides are parallel. The internal angles satisfy 
, 
, and 
. Furthermore , , and . Prove that diagonals , , and are concurrent.
See Also
| 2011 USAMO (Problems • Resources) | ||
| Preceded by Problem 2 |
Followed by Problem 4 | |
| 1 • 2 • 3 • 4 • 5 • 6 | ||
| All USAMO Problems and Solutions | ||
