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Part of 1969 IMO Shortlist

Problems(1)

Prove that we can cover a region with 8 disks

Source:

9/29/2010
(GDR5)(GDR 5) Given a ring GG in the plane bounded by two concentric circles with radii RR and R2\frac{R}{2}, prove that we can cover this region with 88 disks of radius 2R5\frac{2R}{5}. (A region is covered if each of its points is inside or on the border of some disk.)
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