Yeah yeah we know you have to look similar to Rn when we look closer... yeah yeah we heard you

Learn from groups and rings and get yourself a formal definition once and for all

What is the radius of each sphere?

Reference
http://puzzling.stackexchange.com/questions/41952/nine-identical-spheres-fit-exactly-into-a-cube

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(Submitted by @EightosixT)

That's what I call a really focused target (Submitted by @BOUSlD)