Question

The radius of a circle is 18 kilometers. What is the circle's area?
r=18 km
Use ​𝜋 ≈ 3.14 and round your answer to the nearest hundredth.
square kilometers

Answer 1

To calculate the area of a circle, you can use the formula:

\[
\text{Area} = \pi r^2
\]

where \( r \) is the radius of the circle.

Given that the radius \( r = 18 \) kilometers and using \( \pi \approx 3.14 \), we can substitute these values into the formula:

\[
\text{Area} = 3.14 \times (18)^2
\]

First, calculate \( (18)^2 \):

\[
(18)^2 = 324
\]

Now substitute that back into the area formula:

\[
\text{Area} = 3.14 \times 324
\]

Now perform the multiplication:

\[
\text{Area} \approx 1017.96
\]

Rounding to the nearest hundredth, the area of the circle is approximately:

\[
\text{Area} \approx 1017.96 \, \text{square kilometers}
\]

Thus, the area of the circle is **1017.96 square kilometers**.