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

To set out a parallel from a given inaccessible point to a given line

1.	To set out a parallel from a given inaccessible point to a given line AB, the following observations are made: Distance AB and angle PAM = a and angle PBA = b are measured where M is a point on the line BA produced. The perpendicular to the desired parallel line from A and B are:
A.	AB/(cot b – cot a)
B.	AB/(cos b – cos a)
C.	AB/(cot a – cot b)
D.	AB/(cot a – cos b)
Answer» B. AB/(cos b – cos a)