question_answer

If \[{{I}_{1}}\parallel {{I}_{2}}\] and \[{{I}_{3}}\parallel {{I}_{4}},\] then value of z in terms of \['\theta '\] is:

A)  \[\frac{\theta }{2}\]                              

B)  \[90{}^\circ +\theta \]

C)  \[90{}^\circ +\frac{\theta }{2}\]                      

D)  \[90{}^\circ -\frac{\theta }{2}\]

E)  None of these