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d = 56 r = d : 2 = 56:2 = 28
penyelesaian::
v =r²t
234.080 = 22/7 × 28² × t
234.080 × 7 = 22 × 28² ×t
1.638.560 = 17248 × t
1.638.560 ÷ 17248 = t
95 = t