Answer
Circumference is 400m
The circumference is the perimeter of a circle is
[tex]Circumference\text{ of a circle = 2}\pi r[/tex]
To find the radius since the circumference is given as 400
Make radius the subject of the formula
[tex]\text{Radius of first circle }\frac{400}{2\pi}[/tex]
[tex]\text{Radius of first circle }\frac{400}{2\times3.142}=\frac{400}{6.284}=63.654[/tex]
Now the radius of the big circle
It is plus 2
[tex]63.654\text{ +2=65.65}4[/tex]
The circumference of big circle is
[tex]\begin{gathered} \text{The circumference of big circle =2}\pi r \\ \\ \text{The circumference of big circle =2}\times3.142\times65.657 \\ \text{The circumference of big circle =412.5697} \end{gathered}[/tex]
Finally
[tex]412.56-400=12.56[/tex]
The final answer
[tex]12.56[/tex]
