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Panjang Busur PQ = 60°/360° x 2 x 3,14 x 30
Panjang Busur PQ = 1/6 x 6,28 x 30
Panjang Busur PQ = 6,28 x 5
Panjang Busur PQ = 31,4 cm
Semoga Membantu :))