Question

Find the area of circle. Round to the nearest tenth.
The diameter is $6.1$ centimeters.

Answer 1

Calculating the area of circle:

We know that area of circle $={\mathrm{\pi r}}^2$ ,where $\mathrm{r}$ is radius.
Given is the diameter of circle $\mathrm{d}=6.1\mathrm{cm}$
Radius of circle $\mathrm{r}=\frac{6.1}{2}=3.05\mathrm{cm}$
Area of circle $={\mathrm{\pi r}}^2$
$$\begin{gathered} =3.14\times {\left(3.05\right)}^2\mathbf{}\mathbf{[}\mathbf{\because }\mathbf{\pi }\mathbf{=}\mathbf{3}\mathbf{.}\mathbf{14}\mathbf{]} \\ =29.20 \\ \approx 29.2{\mathrm{cm}}^2 \end{gathered}$$

Hence, the area of circle is $29.2{\mathrm{cm}}^2$.