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= 20 : 2
= 10 cm
L1 = ½ x π x r² x t
= ½ x 3,14 x 10 x 10 x 10
= ½ x 314 x 10
= 157 x 10
= 1.570 cm³
L2 = p x l x t
= 30 x 20 x 10
= 6.000 cm 3
Luas seluruhnya = 1.570 + 6.000
= 7.570 cm³
Maaf kalau salah
Semoga bermanfaat :D