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= 2 x 3,14 x 17,5 ( 17,5 + 20 )
= 109,9 ( 37,5 )
= 4121,25 cm²
L.permukaan tabung kecil = 2 x π x r ( r + t)
= 2 x 3,14 , 3,5 ( 3,5 + 10 )
= 21,98 (13,5 )
= 296,73 cm²
Luas permukaan kedua tabung = Lp tabung besar + Lp tabung kecil
= 4121,25 + 296,73
= 4417,98
koreksi ya,siapa tau ada salah