A) \[5\pi /9\]
B) \[2\pi /9\]
C) \[7\pi /9\]
D) \[11\pi /9\]
Correct Answer: A
Solution :
Let \[x+3x+5x={{180}^{o}}\] Þ \[9x={{180}^{o}}\]Þ \[x={{20}^{o}}=\frac{\pi }{9}\] \[\therefore \] Greatest angle is \[\frac{5\pi }{9}.\]
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