+130544 Since PS = PT, then angles PST and PTS are equal
And the measure of either one = [180 - 16] / 2 = 164 / 2 = 82°
And
m<RSQ + m<PST + m<SPT + m<QPT = 180° ..... by substitution, we have ....
43° + 82° + 16° + m<QPT = 180° simplify
141° + m<QPT = 180° subtract 141 from each side
m<QPT = 39° = " y"
