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Dengan seluruhnya telah diketahui.
= 1/3.πr²t + πr²t + 1/2.4/3.πr³
= πr² (1/3.t + t + 2/3.r)
= π.10.10 (1/3.9 + 18 + 2/3.10)
= 100π (3 + 18 + 20/3)
= 100π (21 + 20/3)
= 100π (63/3 + 20/3)
= 100π (83/3)
= 8300/3 π
= 2.766 2/3 π cm³
semoga membantu ya :)