The R.L, of the point A which is on the floor is 100 m and back sight reading on A is 2.45° m. If the foresight reading on the point B which is on the ceiling is 2.74° m, the R.L. of point B will be

Question

Quizplus · Accepted Answer

The R.L. of point B is calculated by subtracting the foresight reading from the height of the instrument (R.L. of A + back sight reading). So, 100 + 2.45 - 2.74 = 99.71 m. However, the correct calculation should be 100 + 2.45 + 2.74 = 105.20 m.

The RL, of the Point a Which Is on the Floor