(b) In the sketch alongside, AQSR lies in a horizontal plane, PS is a vertical line. PQ=14 m, QS = 8 m, PR = 13 m and QPR = 42° and QSR = 0. From Q, the angle of elevation to P is α. From R, the angle of elevation to P is B. Calculate (1) (2) (3) (4) the length of RS. the size of ẞ. the angle of depression of Q from P. the size of 0.

1, the length of RS​