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1/3 = x/2.(22/7).21
1/3 = x/2.22.3
x = (1 . 2 . 22 . 3)/3 = 44
K = 2πr
= 2.(22/7).21
= 2.(22/7).7.3
= 2.22.3
= 132 cm
panjang busur PQ
= (120°/360°)×132 cm
= (⅓).132 cm
= (132/3) cm
= 44 cm