To find the area of a circle, you can use the formula:
\[ \text{Area} = \pi r^2 \]
where \( r \) is the radius of the circle. The radius is half of the diameter. Given that the diameter of the circle is 6 cm, the radius can be calculated as:
\[ r = \frac{\text{diameter}}{2} = \frac{6 \text{ cm}}{2} = 3 \text{ cm} \]
Now, plug the radius into the area formula:
\[ \text{Area} = \pi (3 \text{ cm})^2 = \pi \times 9 \text{ cm}^2 = 9\pi \text{ cm}^2 \]
Using the value of \( \pi \approx 3.14 \):
\[ \text{Area} \approx 9 \times 3.14 \text{ cm}^2 \approx 28.26 \text{ cm}^2 \]
Now, rounding to the nearest tenth:
\[ \text{Area} \approx 28.3 \text{ cm}^2 \]
Thus, the area of the circle is approximately \( \boxed{28.3} \) cm².