All the convex polygons having the following features are regular:

- All their sides are congruent (they have the same size).
- All their internal angles are congruent (they have the same amplitude).

All the regular polygons have the following features:

- If the amount of sides is
**even**, então `n/2` diagonals will pass through the centre of the polygon; (`n` means the amount of sides); - If the amount of sides is
**odd**, none of its diagonals pass through the centre of the polygon.

This is an easy question to answer. It means all the polygons that are not regular.

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