Question

Find the circumference of circle.

Round to the nearest tenth.
The diameter is $6.1$ centimeters.

Answer 1

Calculating the circumference of circle:

We know that circumference of circle $=2\mathrm{\pi r}$ or $\mathrm{\pi d}$, where $\mathrm{r}$ is the radius and $\mathrm{d}$ is the diameter
Given is the diameter of circle $\mathrm{d}=6.1\mathrm{cm}$
Circumference of circle $=\mathrm{\pi d}$
$$\begin{gathered} =3.14\times 6.1\mathbf{}\mathbf{[}\mathbf{\because }\mathbf{\pi }\mathbf{=}\mathbf{3}\mathbf{.}\mathbf{14}\mathbf{]} \\ =19.27 \\ \approx 19.3\mathrm{cm} \end{gathered}$$

Hence, the circumference of circle is $19.3\mathrm{cm}$