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Vb : Vt
4/3πr³ : πr²t
4/3πr³ : πr²(r)
4/3πr³ : πr³
4πr³ : 3πr³
4 : 3
Jadi jika r bola = r tabung = t tabung maka Vb:Vt=4:3
4/3r:t⇒coret πr²
4/3r:r⇒(r=t)
4:3