Posted by **SkaterGirl** on Sunday, December 5, 2010 at 10:38am.

There is a 4 by 4 grid of points. Each pair of horizontally adjacent or vertically adjacent points are separated by a distance of 1 unit. How many circles of radius 1 pass through exactly 2 of these grid points? Justify your response. (Note: the circles must be in

the plane of the grid.)

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