1. In Fig. 6.39, sides QP and RQ of ∆ PQR are produced to points S and T respectively.

1. In Fig. 6.39, sides QP and RQ of ∆ PQR are produced to points S and T respectively.
If ∠ SPR = 135° and ∠ PQT = 110°, find ∠ PRQ.

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