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diameter = 2,21 x 2 = 4,42 cm
r = √(308x7/22 :20)= √4,9cm
maka d=2.√4,9= 2√4,9cm
note:itu volumenya 308 cm³ atau 3080cm³ yah?
soalnya kalai 3080 maka r=7cm dan d=14cm