Answer:
First option.
Third option.
Step-by-step explanation:
The missing figure is attached.
For this exercise it is necessary to remember that the area of a circle can be calculated with the following shown below:
[tex]A_{circle}=\pi r^2[/tex]
Where "r" is the radius of the circle.
As you can notice in the formula, the area of the circle depends on the square of the radius.
Now can identify in the figure attached that, in this case, the radius of the circle is the following:
[tex]r=18\ cm[/tex]
Therefore, knowing the radius, you need to substitute it into the formula given above:
[tex]A_{circle}=\pi (18\ cm)^2[/tex]
Finally, you must evaluate in order to calculate the area of that circle.
Therefore, you get that this is:
[tex]A_{circle}=\pi (324\ cm^2)[/tex]
[tex]A_{circle}=324\pi \ cm^2[/tex]
