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2001 USAMO Problems/Problem 6

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Problem

Each point in the plane is assigned a real number such that, for any triangle, the number at the center of its inscribed circle is equal to the arithmetic mean of the three numbers at its vertices. Prove that all points in the plane are assigned the same number.

Solution

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See also

2001 USAMO (Problems • Resources: AoPS | ML)
Preceded by
Problem 5
1 2 3 4 5 6 Followed by
Last question
Looking for a challenging geometry text? Preparing for MATHCOUNTS or the AMC exams? Check out Art of Problem Solving's Introduction to Geometry by Richard Rusczyk.
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