round peg in square hole is easy
assume side of square is 2
A-circle=3.1415926.... (pi*1^2)
A-square=4 (2^2)
A.C/A.S=.7354

square in circle is slightly harder
diameter circle=2
A-circle=3.14159...
A-square=sqrt.2^2=2
2/3.14...=.63662
round peg is tighter fit

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