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Consider a disk D of radius 1 . We say a collection of shapes hides D if we can place the shapes from that collection
Consider a disk D of radius We say a collection of shapes hides D if we can place the shapes
from that collection on top of the disk in such a way that each point of the disk is under some
part of at least one of the shapes. For example, D can be hidden by a single disk of radius
greaterthanorequalto However, D cannot be hidden by a single disk of smaller radius
than As another example, D can be hidden by disks of radius by placing one radius
disk at the center and the remaining radius disks around the edge of D as follows:
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