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∠PRQ = 180-80-y
∠PRQ = 100-y (Pernyataan 2)
∠PRQ = ∠PRQ
180-3y = 100-y
80 = 2y
40 = y
∠PRQ = 100-y
∠PRQ = 60
or
∠PRQ = 180-3y
∠PRQ = 180-120 = 60
Jawaban A
jadikan jawaban terbaik ya :)