Find the perimeter of a decagon if each side measures 3 cm.

The perimeter of a regular polygon, such as a decagon (a 10-sided polygon), can be found using the formula:

\[
P = n \times s
\]

where:
- \(n\) is the number of sides (for a decagon, \(n = 10\)),
- \(s\) is the length of each side (in this case, \(s = 3 \, \text{cm}\)).

Substituting the values:

\[
P = 10 \times 3 = 30 \, \text{cm}
\]

So, the perimeter of the decagon is \(30 \, \text{cm}\).

Would you like further details or have any questions? Here are some related questions to deepen your understanding:

1. How do you find the area of a regular decagon?
2. What is the sum of the interior angles of a decagon?
3. How does the perimeter change if each side length doubles?
4. What is the difference between a regular and irregular decagon?
5. How do you calculate the circumradius of a regular decagon?

**Tip:** For any regular polygon, multiplying the number of sides by the side length gives the perimeter quickly.

Learn how to calculate the perimeter of a regular decagon, where each side measures 3 cm. This geometry problem involves key concepts such as the perimeter of polygons and the formula P = n × s. Suitable for students in Grades 6-8.

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