The length of an arc LM is given by the formula:
[tex]\begin{gathered} L=\frac{\theta}{360}\times2\pi r \\ \theta=72^0 \\ r=1\text{ unit} \end{gathered}[/tex]
Hence,
[tex]\begin{gathered} L=\frac{72}{360}\times2\pi\times1 \\ =\frac{1}{5}\times2\pi \\ =\frac{2\pi}{5} \\ =0.4\pi \\ \\ \text{Hence, the length of the arc in terms of }\pi\text{ is 0.4}\pi \end{gathered}[/tex]
