If a 20 m chain diverges by a perpendicular distance of 2 m from its correct alignment, the error in the measured length is:

The observed fore bearing of line AB is 266° 30'. Find the back bearing of line AB.

In a closed loop traverse of 1 km total perimeter length, the closing errors in departure and latitude are 0.3 m and 0.4 m respectively. The relative precision of this traverse is: