Q12. - Algebra 1

Question

Find the area of each circle. Round to the nearest tenth.

Step-by-Step Solution

Answer

The area of the circle is $3.1 {\mathrm{km}}^2$.

Step 1. Given information.

In the figure the diameter of the circle is 2 km.

Step 2. Concept used.

The area of a circle with radius r is given by $A=\pi r^2$.

Step 3. Calculations.

$$\begin{gathered} A=\pi r^2 \\ =3.14\times 1^2 \\ =3.14\times 1 \\ =3.14 \end{gathered}$$

Rounding off to the nearest tenth, we get,

$A=3.1{\mathrm{km}}^2$

Thus, the area of the circle is $3.1{\mathrm{km}}^2$.