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a. r = 3,5 d= 3,5 x2 = 7
maka kell = 22/7 x 7 = 22 cm
b. r = 7 d = 7 x 2 = 14
kell = 22/7 x 14 = 44 cm
c. r = 14 d = 14 x 2 = 28
kell =22/7 x 28 = 88 cm
d. r = 28 d = 28 x 2 = 56 cm
kell = 22/7 x 56 =176 cm