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2πrt = 4400
2 . 22/7 . 35 . t = 4400
44/7 . 35 . t = 4400
44 . 5 . t = 4400
220 . t = 4400 : 220
t = 20 cm
Luas tabung tanpa tutup
= πr ( r + 2t )
= 22/7 . 35 (35 + 2 . 20)
= 22 . 5 ( 35 + 40 )
= 110 ( 75 )
= 8250 cm^2