Question
The figure shows a piece of square paper PQRS folded at two of its corners P and R. ∠PTS is 4 times as large as ∠PST and ∠RSU is 12° smaller than ∠PST. Find ∠PSR.
4 m

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The figure shows a piece of square paper PQRS folded at two of its corners P and R. ∠PTS is 4 times as large as ∠PST and ∠RSU is 12° smaller than ∠PST. Find ∠PSR.