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816,4 cm kuadrat = 3,14 x r x 26
816, 4 cm kuadrat = 81,64 r
r = 816,4 : 81,64
r = 10 cm
t kuadrat = s kuadrat - r kuadrat
= 26 kuadrat - 10 kuadrat
= 676 - 100
= 576
= akar dr 576 = 24
= akar dr 24 = 4,8
mka tinggi = 4,8 cm
Volume = 1/3 . phi. r kuadrat. t
= 1/3 x 3,14 x 10 x 10 x 4,8
= 3,14/3 x 480
= 1507,2 / 3
= 502, 4 cm kubik
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