Ex9-4 A survey line PQ is run on a terrain having distance 240 m along a downward slope 1 in 12 from P to A; a distance of 225 m from A to B having an angle of elevation 5°30"; a rise of 20m from B to Q at a distance of 250m. Find the horizontal distance between P and Q if the distances were measured with a 20m tape which was 5cm too long.
Solution : The desired distance, PQ is equal to PA + AB + BQ.
Given, for PA, measured distance, D1 = 240m
