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= 2 x 22/7 x 0,7 x 2
= 61,6/7 = 8,8
Lselimut = 2 x pi x r
= 2 x 22/7 x 0,7
= 30,8/7 = 4,4
luas drum tanpa tutup = 8,8 + 4,4 = 13,2