Find the perimeter of a parallelogram whose adjacent sides measure 25 cm and 20 cm, respectively.

Answer

To find the perimeter of a parallelogram with adjacent sides measuring 25 cm and 20 cm, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the lengths of the sides**:
- Let the length (l) of the parallelogram be 25 cm.
- Let the breadth (b) of the parallelogram be 20 cm.

2. **Understand the properties of a parallelogram**:
- In a parallelogram, opposite sides are equal. Therefore, the opposite side to the length (25 cm) is also 25 cm, and the opposite side to the breadth (20 cm) is also 20 cm.

3. **Use the formula for the perimeter of a parallelogram**:
- The formula for the perimeter (P) of a parallelogram is given by:
\[ P = 2 \times (l + b) \]

4. **Substitute the values into the formula**:
- Substitute l = 25 cm and b = 20 cm into the formula:
\[ P = 2 \times (25 \, \text{cm} + 20 \, \text{cm}) \]

5. **Calculate the sum inside the parentheses**:
- Calculate \( 25 + 20 = 45 \, \text{cm} \).

6. **Multiply by 2 to find the perimeter**:
- Now multiply by 2:
\[ P = 2 \times 45 \, \text{cm} = 90 \, \text{cm} \]

7. **Conclusion**:
- Therefore, the perimeter of the parallelogram is 90 cm.

### Final Answer:
The perimeter of the parallelogram is **90 cm**.