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średnica = d = 10
1/2 d = r
r= 1/2*10 = 5
zatem pole koła = pi 5^2 = 25 pi
wzór na pole kwadratu to a^2
a^2 = 25pi
a = v25pi
a = 5 vpi
odp. bok kwadratu wynosi 5 pierw. z pi .
;)