A) 80o
B) 70o
C) 60o
D) 50o
Correct Answer: C
Solution :
\[\mu =\frac{\sin \frac{A+{{\delta }_{m}}}{2}}{\sin \frac{A}{2}}=\frac{\sin \frac{A+A}{2}}{\sin \frac{A}{2}}=\frac{\sin A}{\sin \frac{A}{2}}\] = \[\frac{2\sin \frac{A}{2}\cos \frac{A}{2}}{\sin \frac{A}{2}}=2\cos \frac{A}{2}\] So, \[\sqrt{3}=2\cos \frac{A}{2}\Rightarrow \frac{\sqrt{3}}{2}=\cos \frac{A}{2}\Rightarrow A={{60}^{o}}\]
You need to login to perform this action.
You will be redirected in
3 sec
