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volume = luas alas x tinggi
1,1 = 22/7 x r² x 1,4
1,1 = 4,4 r²
r² = 1,1 : 4,4
r² = 0,25
r = 0,5 m
tinggi tabung = 1,4m = 140cm
v = la . t
1100000 = 22/7 . r² . 140
1100000 . 7/22 :140 = r²
r² = 2500
r = 50cm