Two stations P and Q on the main survey line were taken on the opposite sides of a pond On the right of PQ a line PR 210 m long was laid down and another l ine PS 260m long was laid down on the left of PQ The points R Q and S are on the sam

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RS = RQ+QS=85+75=160 m
In ∆PRS, Let angle PRS = θ, cos θ = PR2+ RS2– PS2
_____________
2 x PR x RS
cos θ = 2102+ 1602– 2602
_______________
2 x 210 x 160
θ = 88.210
In ∆PQR, Let angle PRS = θ,
cos θ = PR2+ RQ2– PQ2
______________
2 x PR x RQ
Cos88.210= 2102+ 852– PQ2
_____________
2 x 210 x 160

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