Find the side of a square whose perimeter is 80 cm ?

Answer

To find the side of a square whose perimeter is 80 cm, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the formula for the perimeter of a square.**
The perimeter (P) of a square is given by the formula:
\[ P = 4 \times \text{side} \]

2. **Set up the equation using the given perimeter.**
We know from the problem that the perimeter is 80 cm. Therefore, we can write:
\[ 80 = 4 \times \text{side} \]

3. **Solve for the side.**
To find the length of one side, we need to isolate the side variable. We can do this by dividing both sides of the equation by 4:
\[ \text{side} = \frac{80}{4} \]

4. **Calculate the value.**
Now, perform the division:
\[ \text{side} = 20 \text{ cm} \]

5. **Conclusion.**
Therefore, the length of each side of the square is 20 cm.

### Final Answer:
The side of the square is 20 cm.