Θ1 and θ2 are the angels of elevation from ‘A’ to the top and bottom of a vertically held rod of length ‘S’ at B. The horizontal distance AB will be
1
\(\frac{{\rm{s}}}{{\tan {{\rm{\theta }}_1} + \tan {{\rm{\theta }}_1}}}\)
2
\(\frac{{\rm{s}}}{{\tan {{\rm{\theta }}_1} - \tan {{\rm{\theta }}_2}}}\)
3
\(\frac{{\rm{s}}}{{\tan {{\rm{\theta }}_2} - \tan {{\rm{\theta }}_1}}}\)
4
S(tanθ1 – tan θ2)