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In the diagram, the three concentric circles have radii of 4, 6, and 7. Three regions are labeled X, Y, or Z below. Of these three regions, what is the difference between the area of the region with the greatest area and the area of the region with the smallest area? Express your answer in exact form.

 Apr 6, 2022
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The difference is 15*pi.

 Apr 7, 2022

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