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Keliling Lingkaran = 3,14 x 20 = 62,8 cm
Luas Juring = 120/360 x 314
= 1/3 x 314
= 104,6
Panjang busur = 120/360 x 62,8
= 1/3 x 62,8
= 20,93
panjang busur nya = 20,93