To find the diameter of a circle when you have the area, you can use the formula for the area of a circle:
\[ A = \pi r^2 \]
where \( A \) is the area and \( r \) is the radius. We can rearrange this formula to find the radius:
\[ r = \sqrt{\frac{A}{\pi}} \]
Once we find the radius, we can find the diameter (\( d \)) using the formula:
\[ d = 2r \]
Now, given that the area \( A \) is 674 m², let's calculate the radius:
\[ r = \sqrt{\frac{674}{\pi}} \approx \sqrt{\frac{674}{3.14159}} \approx \sqrt{214.62} \approx 14.66 \text{ m} \]
Now, calculate the diameter:
\[ d = 2r \approx 2 \times 14.66 \approx 29.32 \text{ m} \]
Rounding this to the nearest meter gives us a diameter of approximately 29 m.
Thus, the answer is \( 29 \).