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L.selimut=keliling lingkaran x t
136π=2πr x t
136=2 x 8 xt
136=16 x t
136/16=t
t=8,5 cm
luas lingkaran=πr²
=π x 8²
=64π cm²
maka,
v.kerucut=L.lingkaran x t
=64π x 8,5
=544π cm³
maaf kalau salah............