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27 : V2 = (r1)² .t1 : (r2)² .t2
27 : V2 = (r1)² .t1 : (2.r1)² .2.t1
27 : V2 = (r1)² .t1 : 4 (r1)² .2.t1
27 : V2 = 1 : 8
V2 = 8 . 27
V2 = 216 cm³ ... jawaban : B