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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
Want to learn how to tackle those tough MATHCOUNTS and AMC counting and probability problems? Check out Art of Problem Solving's Introduction to Counting & Probability by David Patrick.
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