In the diagram If lt RPS 50o lt RPQ 30o and pq ... - JAMB Mathematics 2000 Question

< QPR = < PRQ = 30^o (PQ = QR)

< SPQ + < QRS = 180^o (supplementary)

80 + < QRS = 180^o = < QRS = 180^o - 80^o = 100^o

< QRP + < PRS = 100^o = 30^o + < PRS = 100^o

= < PRS = 100^o - 30^o = 70^o