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D = 21 cm, maka r = 21/2 = 10,5
phi = 22/7
V = 1/3 πr² . tinggi
V = 1/3 . 22/7 . 10,5² . 30
V = 1/3 . 22/7 . 110,25 . 30
V = 1/3 . 22/7 . 3307,5
V = 1/3 . 10395
V = 3465 cm³
= 22/21. 110,25. 30= 2425,5/21.30= 72765/21= 3465cm