Decagon
A polygon with 10 sides
In a deck of cards the highest number is a 10 (Dec has the same word root as decade which is 10 years).
Example 1
All 10 sides of a regular decagon are equal in length.
Example 2
The internal angle between the sides of a regular decagon is 144°.
Example 3
An irregular decagon such as the one above may be convex as in this case.
Example 4
The decagon above is an irregular concave decagon.
Example 5
This star shape is an irregular decagon as the internal angles between the sides are not all equal.
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