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660 = 2 . 22/7 . r . 15
660 = 660/7 r
r = 660 : 660/7
r = 660 . 7/660
r = 7 cm
diameter = 2.r
= 2.7 = 14 cm
Jadi diameter tabung adalah 14 cm
660=2.22/7.r.15
660=660/7.r
r=660×7/660
r=7 cm
d=14 cm