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a - bok trójkąta
R=a√3/3 promień okręgu opisanego
a=3R/√3
a=3√3R/3
a=√3R
2.
kwadrat
R=a√2/2
a=2R/√2
a=2√2R/2
a=√2R
3.
szesciokąt
R=a
a=R