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30 = 2x22/7xr
r=30x7/44 = 210/44 = 4 17/22
r diperpajang 2x = 2 x 4 17/22 = 9 12/22 atau 9 6/11
kelilingnya menjadi = 2x22/7x9 6/11 = 60cm (jawaban yang b)
aku ambil simplenya aja 30×2=60