Also given \({i}=2 {r}_{1}={A}\)

Now \(1 \sin i =\sqrt{3} \sin r_{1}\)

\(1 \sin A=\sqrt{3} \sin \frac{A}{2}\)

\(2 \sin \frac{A}{2} \cos \frac{A}{2}=\sqrt{3} \sin \frac{A}{2}\)

\(\cos \frac{A}{2}=\frac{\sqrt{3}}{2} \Rightarrow \frac{A}{2}=30^{\circ}\)

\(A=60^{\circ}\)