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. . . View This Fullsize
Here's a screen grab of one of @ddmeyer's videos: Penny Circle.
If this were a 0.75" circle, the penny would fit perfectly. If it's 1" then there would be a lot of wasted space. What sizes of circle would be best for packing in 0.75" pennies with as little wasted space as possible?
.: [GEOM], [Dan Meyer], [3ACT].