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528 cm = 22/7 . diameter . 12
528/12 = 22/7 . diameter
44 =22/7 . diameter
diameter = 44 . 7/22
diameter = 14
jari-jari = 7cm
semoga membantu
528=2×22/7×r×12
528×7=2×22×r×12
3696=528r
r=3696/528
r=7cm