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luas permukaan = 748 cm
jari jari = 7
dit
tinggi tabung
jwb.
l. permukaan = 2.pi.r (r+t)
748 = 2. 22/7 . 7 ( 7+t)
748 = 44. (7+t)
748/44 = 7+t
17-7 =t
10 = t