What is a regular polygon?

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.

What is an irregular polygon?

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

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