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25 cm : 22/7 x 25 = 78,5
49 cm : 22/7 x 49 = 154
3,5 cm : 22/7 x 3,5 = 11
21 ---> 22/7 x 21 x 21 = 1386
25 ----> 3.14 x 25 x 25 = 1962, 5
49 -----> 22/7 x 49 x 49 = 7546
3.5 -----> 3.14 x 3.5 x 3.5 = 38, 465