Question

angle QTR=1/2 angle QPR

Answer 1

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Answer 2

Here it is..
/_TRS=/_QTR+/_TQR
/_QTR=/_TRS-/_TQR (TRANSPOSING ANGLE QTR AND ANGLE TRS)
ANGLE QTR=1/2 · ANGLE PRS - 1/2 · ANGLE PQR
ANGLE QTR=1/2(Angle PQR+ANGLE QPR) - 1/2 ANGLE PQR
ANGLE QTR=1/2 ANGLE QPR