THE CORRECT ANSWER IS (D). M∠ =P 21(QRT−QST)LET M QST = XºTHEN M Q...

39. The correct answer is (D). m∠ =P 21

(

QRTQST

)

Let m QST = xºThen m QRT = 360 – xºSubstitute in the first equation.Combine terms and multiply by 2.