Polygons can have many sides, such as triangles with 3 sides, quadrilaterals with 4 sides, and polygons with increasing numbers of sides up to 20 or more. Polygons are either convex, with interior angles all less than 180 degrees, or non-convex, with at least one interior angle greater than 180 degrees. Regular polygons have all sides and interior angles of the same measurement.

1. POLYGONS

2. THERE ARE MANY POLYGONS
SUCH AS
The triangle (3 sides);
The quadrilateral (4 sides);
The pentagon (5 sides);
The hexagon (6 sides);
The heptagon (7 sides);
The Octagon (8 sides);
The enneagon (9 sides);
The decagon (10 sides);
The dodecagon (12 sides);
And lastly the icoságono (20 sides).

3. NON CONVEX AND CONVEX
POLYGONS
A polygon is convex if all its interior angles have a measured
amplitude of less than 180 º.
convex polygon not convex

4. REGULAR POLYGONS
A polygon that has all sides and all internal angles matching
is said to be a regular polygon.
Eg:

5. Done by:
CATARINA
LEONOR 5ºD
2012
School 2.3
Azeitão