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# Polygon Classification

## Categories of polygons based on the number of sides.

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Geometry Definitions and Introduction to Proof

Word Problem--Solve for the Side of a Regular Polygon.
Teacher Contributed
The lengths of two sides of a regular enneagon are represented by the expressions $\left(7x+19\right)$$(7x + 19)$ and $\left(12x-11\right)$$(12x -11)$. What is the length of one side of the enneagon?
qid: 100104
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