Polygons 
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1. Convex and concave polygon
A polygon is a closed plane figure made up of several line segments that are joined together.
In the picture, there are two polygons: A and B.
Every angle of the polygon A is less than or equal to 180°. It is called a convex polygon.
The polygon B has an angle that is greater than 180°. It is called concave polygon.
2. Types of polygons based on number of sides
We have the following polygons: the triangle (threesided polygon), the quadrilateral (foursided polygon), the pentagon (fivesided polygon), the hexagon (sixsided polygon), heptagon (sevensided polygon), the octagon (eightsided polygon), the nonagon (ninesided polygon) and the decagon (tensided polygon).
Answer these questions:
The polygon A is... 

The polygon B is... 

The polygon C is... 

The polygon D is... 

The polygon E is... 
3. Irregular Polygons
Note that the polygons F to K do not have all sides equal and all angles equal. These polygons are called irregular.
Answer these questions:
The polygon F is... 

The polygon G is...... 

The polygon H is...... 

The polygon I is... 

The polygon J is... 

The polygon K is... 
4. Regular Polygons
A polygon with equal sides and angles is called regular.
Answer these questions:
The polygon L is... 

The polygon M is... 

The polygon N is... 

The polygon O is... 

The polygon P is... 
5. Polygon parts
Look at the polygon ABCDE! Each point is a vertex. In the picture, there are 5 vertices: A, B, C, D and C. The sides are the line segments that make up the polygon. In this case, we have 5 sides: AB, BC, CD, DE and EA.
The diagonal is all line connecting two non consecutive vertices. In the picture, we can see that there are two diagonals per vertex. There are 5 diagonals: AC, AD, BD, BE and CE.
Look at the picture and answer:
The A is... 

The AB is... 

The AC is... 

The AD is... 

The D is... 

The AE is... 

The B is... 

The C is... 

The CD is... 

The BE is... 

The BC is... 

The CA is... 
 Educational applications 
Mathematics 
In Spanish  Interactive
®Arturo Ramo García.Record of intellectual property of Teruel (Spain)
No 141, of 29IX1999
Plaza Playa de Aro, 3, 1º DO 44002TERUEL