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phi × r2 × tinggi
phi = 22/7 .. karena salah satu angkanya dapat di bagi 7 (kelipatan 7) ... jika bukan kelipatan 7 menggunakan 3,14
r(jari-jari) = 21 ÷ 2 = 10,5 cm
tinggi = 14 cm
22/7 × 10,5 × 10,5 × 14
= 4.361 cm3
semoga membantu