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a. panjang busur AB = K(lingkaran) x sudut juring / 360
k= 2. 3,14 . 10 = 62,8 cm
62,8 x 120 = 20,9
360
b. luas juring = L(lingkaran) x sudut juring / 360
l= πr² = 3,14 x 100= 314cm²
314 x 120 =104,6
360