Ex.8-1 Describe how you would range a survey line between two stations which are not inter visible?

Ex.8-2 A survey line AB crosses a river obliquely. P and Q are two points selected on the line one at each end of the river. Another line EPF is run parallel to the centre line of the river and point E is such that angle QEP is right angle and EP = PF = 100 m. A third point G is set at a distance of 150 m from P such that angle GFP is also right angle. Compute the distance PQ.

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