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2x + (3x-20) =180
5x = 200
x= 40
Sudut PRQ = 80
Jumlah sudut dalam segitiga 180
Maka
< QPR + < PRQ + < RQP =180
< QPR + 80 +40 = 180
< QPR +120 = 180
< QPR =60
Jawaban C