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V=πr²H
V=π8²×9
V=576π
V=4/3πR³
576π=4/3πR³/¾
¾x576=R³
432=R³/∛
R=∛432=∛216x2=6∛2
2.
V=⅓πr²H
V=⅓π4²x16
V=736/3π
V=4/3πR³
736/3π=4/3πR³/¾
R³=¾×736/3
R³=184/∛
R=∛184=∛8x23=2∛23