A puzzle, hope people enjoy!
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I think you have to unwrap the cube then it is more simple. It’s then sqrt(1^2 + 2^2 )=sqrt(5)=2.2360679775
I’m sure there’s a more technical explanation, but my assumption is two lines forming 45 degree angles at the corner of the points so ((12+0.52)^0.5)*2= 5^0.5 or square root of 5 or roughly 2.236
Sorry for the formatting. I’m on mobile and missing some symbols that would make that easier to read
I thought it would be 2*sqrt(1.5)=2.449
Or for side x it will be 2sqrt(1.5x^2)