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V = 1/3 πr²t
= 1/3. 3,14 . 64 . 15
= 1.004,8cm³
b. r = 7cm
s = 25
t = √ 625 - 49
t = √ 576
= 24cm
V = 1/3 πr²t
= 1/3 . 22/7 . 49 . 24
= 1232cm³
c. r=10 cm dan t= 21 cm
V = 1/3 πr²t
= 1/3 . 3,14 . 100 . 21
= 2.198cm³