[MP PET 2003]
A) $ 20{}^\circ $
B) $ 60{}^\circ $
C) $ 45{}^\circ $
D) $ 30{}^\circ $
Correct Answer: D
$ \mu =\frac{1}{\sin C}\Rightarrow C={{\sin }^{-1}}( \frac{1}{2} )=30^{o} $
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