1.

\left. \begin{array} { l l } { \frac { \pi } { 2 } } & { ( 2 ) \frac { \pi } { 3 } } \\ { \frac { \pi } { 4 } } & { ( 4 ) } & { \frac { \pi } { 5 } } \end{array} \right.

Answer»

radian = 60° x π/180 = π/3

hence, option (b) is correct



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