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t.limas kecil=21
V arsir=Vbesar-Vkecil
=1/3.π.r².t-1/3.π.r².t
=1/3π(r².t - r².t) (karena jari jari dan tingginya berbeda)
=1/3.22/7(12².42-6².t21)
=1/3.22/7(144.42-36.21)
=1/3.22/7(6048-756)
=1/3.22/7(5292)
=5544