The area of a circle is `1386 m^(2)`. Find its circumference. 

Answer

To find the circumference of a circle when the area is given, we can follow these steps:

### Step 1: Write down the formula for the area of a circle.
The area \( A \) of a circle is given by the formula:
\[ A = \pi r^2 \]
where \( r \) is the radius of the circle.

### Step 2: Substitute the given area into the formula.
We know from the problem that the area \( A \) is \( 1386 \, m^2 \). Therefore, we can write:
\[ \pi r^2 = 1386 \]

### Step 3: Use the value of \( \pi \).
For calculations, we can use \( \pi \approx \frac{22}{7} \). Substituting this into the equation gives:
\[ \frac{22}{7} r^2 = 1386 \]

### Step 4: Solve for \( r^2 \).
To isolate \( r^2 \), we can multiply both sides by \( 7 \) to eliminate the fraction:
\[ 22 r^2 = 1386 \times 7 \]
Calculating \( 1386 \times 7 \):
\[ 1386 \times 7 = 9702 \]
Thus, we have:
\[ 22 r^2 = 9702 \]

### Step 5: Divide by 22 to find \( r^2 \).
Now, we divide both sides by \( 22 \):
\[ r^2 = \frac{9702}{22} \]
Calculating \( \frac{9702}{22} \):
\[ r^2 = 441 \]

### Step 6: Find the radius \( r \).
To find \( r \), we take the square root of \( r^2 \):
\[ r = \sqrt{441} = 21 \, m \]

### Step 7: Use the radius to find the circumference.
The formula for the circumference \( C \) of a circle is:
\[ C = 2 \pi r \]
Substituting the value of \( \pi \) and \( r \):
\[ C = 2 \times \frac{22}{7} \times 21 \]

### Step 8: Simplify the expression.
Calculating this step-by-step:
1. First, calculate \( 2 \times 22 = 44 \).
2. Then, \( 44 \times 21 = 924 \).
3. Finally, divide by \( 7 \):
\[ C = \frac{924}{7} = 132 \, m \]

### Final Answer:
The circumference of the circle is \( 132 \, m \).

---