Designs shape is:
So length is :
Perimeter of half circle is:
[tex]\text{ Perimeter =}\pi r+2r[/tex]Radius of circle is:
[tex]\begin{gathered} r=\frac{D}{2} \\ r=\frac{4}{2} \\ r=2 \end{gathered}[/tex]So the length is:
[tex]\begin{gathered} =4(\pi r+2r) \\ =4(2\pi+2(2)) \\ =4(2\pi+4) \\ =4(6.283+4) \\ =4\times10.283 \\ =41.132 \end{gathered}[/tex]So the approximate length is 41 centimeter.