POLYGONS

Yes, it’s another Greek word. ‘Poly’ meaning multiple or more than 2 in this case, and ‘gon’ meaning angle. So a polygon is a geometric 2-dimensional figure made up of 3 or more line segments, called sides, and has 3 or more angles.

There are 2 more requirements for a polygon:

· The sides of a polygon are connected end to end and make a closed path.

· The sides of a polygon do not cross (intersect).

Here are some samples of polygons:

These are not polygons:

Curved line is not a line segment.	The sides must form a closed path.
A polygon must have at least 3 sides.	The sides of a polygon must not cross.

Convex polygons – is a polygon in which all the sides are pushed outward.

Triangle

Quadralateral

Pentagon

Hexagon

Nonconvex (concave) polygons have at least two sides pushed in.

Quadralateral

Hexagon

Pentagon

Octagon

A polygon is a regular polygon if:

· The sides are all the same length

· The angles are all the same size.

Equilateral triangle

Square

Octagon