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44 = 1/5 . Kell.
Kell.= 44 : 1/5
= 44 . 5/1
= 220 cm
kell = π.d
220 = 22/7 . d
d = 220 : 22/7
= 220 . 7 /22
= 7 cm
r= 7/2 = 3,5 cm