I4.4 A wire of $c \mathrm{~cm}$ is bent to form a sector of radius $1 \mathrm{~cm}$. What is the angle of the sector in degrees (correct to the nearest degree)?
Let the angle at centre be $\theta$ radians.
$$
\begin{array}{l}
2+1 \times \theta=3 \\
\theta=1 \text { radian }=\frac{180^{\circ}}{\pi} \approx 57.3^{\circ}=57^{\circ} \text { (correct to the nearest degree) }
\end{array}
$$