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= 1/3 x 2 x 22/7 x 21
= 44 cm
a = 120
r = 21 cm
d = 21x2 = 42 cm
keliling lingkaran = πd
= 22/7 x 42
= 132 cm
Jawab :
Pajang busur = a/360 x keliling lingkaran
= 120/360 x 132
= 44 cm