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(a) PQRS is a trapezium with  SP // RQ.

(b) OQ = OR  and OP = OS and RQ is a shared line => OQRS is also a rhombus

     So triangle SRO is an equilateral triangle since all 3 sides are equal, => all angles are 600

      ROT = 90+60 = 150

      RTO = (180-150) / 2 =15

      STO = 45

      Hence RTS = 45-15 = 30

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