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120 = 4 π. r²
π .r² =
π.r² = 30
L.permukaan tabung = 2. L.alas + kliling alas x t
= 2 . π. r² + 2. π r x 2r
= 2.π.r² + 4.π.r²
= 2 . 30 + 4 . 30
= 60 + 120
= 180 cm²
=60 + 120
=180