Find the perimeters of :
A rectangle of length 12 cm and breadth 7.5 cm .

Answer

To find the perimeter of a rectangle with a length of 12 cm and a breadth of 7.5 cm, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the formula for the perimeter of a rectangle.**
- The formula for the perimeter (P) of a rectangle is given by:
\[ P = 2 \times (\text{Length} + \text{Breadth}) \]

2. **Substitute the given values into the formula.**
- Here, the length (L) is 12 cm and the breadth (B) is 7.5 cm.
- Substitute these values into the formula:
\[ P = 2 \times (12 \, \text{cm} + 7.5 \, \text{cm}) \]

3. **Calculate the sum of the length and breadth.**
- First, calculate the sum:
\[ 12 \, \text{cm} + 7.5 \, \text{cm} = 19.5 \, \text{cm} \]

4. **Multiply the sum by 2 to find the perimeter.**
- Now, multiply the sum by 2:
\[ P = 2 \times 19.5 \, \text{cm} = 39 \, \text{cm} \]

5. **State the final answer.**
- Therefore, the perimeter of the rectangle is:
\[ P = 39 \, \text{cm} \]

### Final Answer:
The perimeter of the rectangle is **39 cm**.