50o
60o
70o
80o
Correct answer is C
< QPR = < PRQ = 30o (PQ = QR)
< SPQ + < QRS = 180o (supplementary)
80 + < QRS = 180o = < QRS = 180o - 80o = 100o
< QRP + < PRS = 100o = 30o + < PRS = 100o
= < PRS = 100o - 30o = 70o
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