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12,56 = 1/9 . 3,14 . d
12,56 . 9 / 3,14 = d
36 = d
12,56 = 1/9 . 2. 3,14 . r
12,56 . 9 / 2. 3,14 = r
7, 70 = r
d = 2r
d = 2.7,70
d=15,4 cm