SSC JE Civil Engineering 29-Oct-2020 Shift 1 Paper

FB of line BA is BB of line AB.
The relation b/w FB and BB of a line is given as;
BB = FB ± 180°
If FB > 180° then use minus sign
If FB ≤ 180° then use plus sign
Given that FB of AB = 40° 15’ i.e. less than 180°. So, we will use plus sign.
BB of AB = FB of BA = FB of AB + 180° = 40° 15’ + 180°
∴ FB of BA = 220° 15’