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x / 360 derajat * 22/7 * 7² = 64 1/6
x / 360 derajat * 154 = 385 / 6
154x / 360 = 385 / 6
154x * 6 = 360 * 385
924x = 138.600
x = 138.600 / 924
x = 150 derajat
panjang busur juring :
150/360 * 2πr
= 5/12 * 2 * 22/7 * 7
= 5/12 * 44
= 220 / 12
= 18 4/12
= 18 1/3 cm