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Sudut pusat dihadapan sudut 120
= 1/2(360 -120)
= 1/2(240)
= 120 derajat
r = 21 cm
Dijawab :
Panjang busur = keliling lingkaran x 120/360
= 2πr x 1/3
= 2 . 22/7 . 21 . 1/3
= 132/3
= 44 cm
Jadi, panjang busurnya adalah 44 cm.
P= 2.22/7.21 x 1/3
P= 132/3
P= 44