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2826 = 4. 3,14 . r2
2826 = 12,56 . r2
r2 = 2826 : 12,56
r2 = 225
r = 15
V = 4/3 . r3
V = 4/3 . 3,14 . 15 . 15 . 15
V = 251,2 . 225
V = 56520 cm3
2826 = 4 . 3,14 . r²
r² = 2826 : 4 . 3,14
r² = 2826 : 12,56
r² = 225
r = √225 = 12
Vollume = 4/3πr³
= 4/3 . 3,14 . 15 . 15 . 15
= 251,2 . 225
= 56520 cm³