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123,2 = 1/5 x 22/7 x r²
123,2 = 22/35 x r²
r² = 123,2 x 35/22
r² = 196
r = 14 cm
panjang busur PQ = 72/360 x 2πr
= 1/5 x 2 x 22/7 x 14
= 17,6 cm
semoga membantu ya:)