The cricumference formula is given by:
![C=\pi *d](https://img.qammunity.org/2023/formulas/mathematics/middle-school/al0cxds3zmmvem335j8zuq5j9agdtceask.png)
where C denote the circumference, d the diameter of the circle and Pi is the constant equal to 3.14.
Case 1.
In this case, d=5.5 cm, then by substituting this value into the formula, we get
![\begin{gathered} C=3.14*5.5 \\ C=17.27\text{ cm} \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/hc1ciooe2bzwab3lhpkuf52wqcmrgni0n3.png)
Case 2.
Now, by substitutinfg d=8m, into the circumference formula, we get
![\begin{gathered} C=3.14*8m \\ C=25.12m \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/t7y2dy5go97g8vil9yew87fyo2ynerme1d.png)
Case 3.
Finally, by substituting d=5.8m into the formula, we obtain
![\begin{gathered} C=3.14*5.8m \\ C=18.212\text{ m} \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/a4a6h2xslgrzmh6qiq04xt5bcfbzmsuwfo.png)
In summary, the answers are:
![\begin{gathered} 1)\text{ C=17.27cm} \\ 2)\text{ C=25.12 m} \\ 3)\text{ C=18.212 m} \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/e7a770382u01ck9f93bvtegmftvjiwz5a9.png)