Surveying - Engineering

Q1:

To set out a parallel from a given inccessible point to a given line AB, the following observations and made
Distance AB and angle PAM = a and angle PBA = b are measured where Mis a point on the line BA produced. The perpendicular to the desired parallel line from A and B are :

A

B

C

D

ANS:A -

Let PC be the length of perpendicular.

AB = AC + CB = PCcot(180-a) + PCcotb,
Thus, PC = AB/(cotb - cota).