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28 = x/360 πr²
28×360 = x πr²
10080 = xπr² pers 1
busurab = x/360×2×πr
4 = x/360×2×πr
4×360/2 = xπr
720 = xπr
lihat pers 1
xπr² = 10080
xπr.r = 10080
720.r = 10080
r = 10080/720 = 14
jari2 14