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2018 AMC 12B Question 8

AMC12 · 2018 AMC 12B

Question 8

Line segment $\overline{AB}$ is a diameter of a circle with $AB=24.$ Point $C,$ not equal to $A$ or $B,$ lies on the circle. As point $C$ moves around the circle, the centroid (center of mass) of $\triangle ABC$ traces out a closed curve missing two points. To the nearest positive integer, what is the area of the region bounded by this curve?
  1. $25$
  2. $38$
  3. $50$
  4. $63$
  5. $75$