13 in

Shape: Circle
Calculate the area of the circle.
Area of a circle: 3.14 x r²
A = [?] in²
Round to the nearest hundredth.

1 answer

To calculate the area of a circle, we use the formula:

\[ A = \pi \times r^2 \]

where \( r \) is the radius of the circle. Given that the diameter is 13 inches, we can find the radius \( r \) by dividing the diameter by 2:

\[ r = \frac{13}{2} = 6.5 \text{ inches} \]

Now, we can substitute the radius into the area formula:

\[ A = 3.14 \times (6.5)^2 \]

First, calculate \( (6.5)^2 \):

\[ (6.5)^2 = 42.25 \]

Now, plug this value into the area formula:

\[ A = 3.14 \times 42.25 \]

Calculating this gives:

\[ A \approx 133.455 \]

Now, round to the nearest hundredth:

\[ A \approx 133.46 \text{ in}^2 \]

Thus, the area of the circle is approximately:

\[ \boxed{133.46} \text{ in}^2 \]