Calculate the clockwise horizontal angle to be set off at p

Reference no: EM13962106

A straight tunnel is to be driven between stations P and S which are on opposite sides of a hillside. Stations

Q and R were located such that P can be seen from Q and S can be seen from R with Q and. S being intervisible. The following observations were made:

Clockwise horizontal angles
PQR = 78^°14'26
QRS = 81^°16'45"

Horizontal distances (rn) AQ = 126.59
QR = 915.
RS = 109.32

The coordinate of P are 1716.32 E, 6897.14 N and bearing PQ is 17218'39". Calculate:

a. The clockwise horizontal angle to be set off at P from PQ to the centre line of the tunnel

b. The clockwise horizontal angle to be set of at S from SR to the centre line of the tunnel

c. Horizontal length of the tunnel if P is located a horizontal distance of 45.19 m from one end of the tunnel and S is located a horizontal distance of 87.44 m from the other end. The tunnel falls within the line PS.

Reference no: EM13962106

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