A) \[{{\theta }_{i}}+{{\theta }_{c}}={{\theta }_{n}}\]
B) \[{{\theta }_{i}}-{{\theta }_{c}}=2{{\theta }_{n}}\]
C) \[\frac{{{\theta }_{i}}-{{\theta }_{c}}}{2}={{\theta }_{n}}\]
D) \[{{\theta }_{c}}-{{\theta }_{i}}=2{{\theta }_{n}}\]
Correct Answer: C
Solution :
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