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SUDUT PSQ = 180 - 90 - 50 = 40
maka
sudut PQR = 70 + 40 = 110
PQS = (180⁰ - 50⁰ -50⁰ ) : 2
= 80⁰ : 2
= 40⁰
PQR = 70⁰ + 40⁰
= 110⁰
jawabannya B