If the side of a regular pentagon be 5 cm, find the circumference of the pentagon, in cm.

Options

A. 21
B. 20
C. 30
D. 25

Answer

To find the circumference (or perimeter) of a regular pentagon with each side measuring 5 cm, follow these steps:

### Step-by-Step Solution:

1. **Understand the Shape**: A regular pentagon has 5 equal sides.

2. **Identify the Length of Each Side**: According to the problem, each side of the pentagon is 5 cm.

3. **Calculate the Total Number of Sides**: A pentagon has 5 sides.

4. **Use the Perimeter Formula**: The perimeter (or circumference) of a polygon is calculated by summing the lengths of all its sides. For a regular polygon, this can be simplified to:
\[ \text{Perimeter} = \text{Number of sides} \times \text{Length of one side} \]

5. **Plug in the Values**: For our pentagon:
\[ \text{Perimeter} = 5 \times 5 \text{ cm} \]

6. **Perform the Calculation**:
\[ \text{Perimeter} = 25 \text{ cm} \]

7. **Conclusion**: The circumference of the pentagon is 25 cm.

### Final Answer:
The circumference of the pentagon is 25 cm.

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