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L₁-L₂ = 234 selisih V = r³-r³
6.r² - 6.r² = 234 =8³-5³
r²-r² = 234/6 =512-125
r²-r² = 39 =387 cm
64-25(dicari satu2 dan dikurangkan) = 39
√64 = 8
√25 = 5