The two targets are at a distance s apart, and each at s/2 from the centre, i.e. vertical axis. The horizontal angle ‚âà√≠¬¨¬± is measured carefully by means of a theodolite. Then what is the value of D in the subtense bar method?$

The two targets are at a distance s apart, and each at s/2 from the ce

1.	The two targets are at a distance s apart, and each at s/2 from the centre, i.e. vertical axis. The horizontal angle ‚âà√≠¬¨¬± is measured carefully by means of a theodolite. Then what is the value of D in the subtense bar method?$
A.	s/2‚âà√≠¬¨¬±
B.	s/‚âà√≠¬¨¬±
C.	s/4‚âà√≠¬¨¬±
D.	2s/‚âà√≠¬¨¬±
Answer» C. s/4‚âà√≠¬¨¬±