A. $$\frac{{\prod R\phi }}{{180}}$$
B. $$R\,\operatorname{Tan} \frac{\phi }{2}$$
C. $$2R\,\sin \frac{\phi }{2}$$
D. $$R\left( {\sec \frac{\phi }{2} - 1} \right)$$
Answer: Option D
This Question Belongs to Mining Engineering >> Mine Surveying
The stations choosed by main survey lines called . . . . . . . .
A. Temporary stations
B. Main stations
C. Subsidary station
D. None
The 90° corners of a building are set out on the ground by, easily . . . . . . . .
A. Cross staff
B. Mason's square
C. Theodolite
D. Optical square
The arithmetical check for levelling is . . . . . . . .
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
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