A circular mirror has a diameter of 12 inches.

What is the area, in square inches, of the mirror?

A. [tex]$6 \pi$[/tex]
B. [tex]$12 \pi$[/tex]
C. [tex]$36 \pi$[/tex]
D. [tex]$72 \pi$[/tex]



Answer :

To find the area of the circular mirror, follow these steps:

1. Determine the radius of the circle:
- Given that the diameter of the mirror is 12 inches, we can find the radius by dividing the diameter by 2. Therefore,
[tex]\[ \text{Radius} = \frac{\text{Diameter}}{2} = \frac{12}{2} = 6 \text{ inches}. \][/tex]

2. Recall the formula for the area of a circle:
- The area [tex]\( A \)[/tex] of a circle is given by the formula:
[tex]\[ A = \pi r^2, \][/tex]
where [tex]\( r \)[/tex] is the radius of the circle.

3. Substitute the radius into the formula:
- Using the radius we calculated, which is 6 inches, we substitute [tex]\( r = 6 \)[/tex]:
[tex]\[ A = \pi (6)^2 = \pi \times 36 = 36\pi \text{ square inches}. \][/tex]

So, the area of the mirror is:
[tex]\[ A = 36\pi \text{ square inches}. \][/tex]

The correct answer is:
C. [tex]\( 36\pi \)[/tex]