In tachometric observations, the staff readings are found to be 2.4m, 3m and 3.6m. If the angle of elevation is 45m the multiplying factor is 100 and the additive constant is 0.3m then horizontal distance between the staff and the instrument station expressed in m is . . . . . . . .

A. Temporary stations B. Main stations C. Subsidary station D. None

A. 16880m² B. 8440m² C. 1688m² D. 844m²

A. Cross staff B. Mason's square C. Theodolite D. Optical square

A. $$\sum {BS} + \sum {FS = {\text{First RL + Last RL}}} $$ B. $$\sum {FS} - \sum {BS} = {\text{Last RL + First RL}}$$ C. $$\sum {BS} - \sum {FS} = {\text{Last RL}} - {\text{ First RL}}$$ D. All