Slide 2: Polygons are named according to the number of sides. The names of the most common polygons are given below:
Slide 3: Names of other polygons:
Names of Polygons by Number of Sides and Angles : Names of Polygons by Number of Sides and Angles
The following figures are NOT Polygons: : The following figures are NOT Polygons:
Regular Polygons : Regular Polygons All sides have the same length
All angles have the same measure
Examples of Regular Polygons:
Irregular Polygons : Irregular Polygons If a polygon is not a regular polygon, then it is said to be an irregular polygon.
For example, the quadrilateral shown below is an irregular polygon.
Concave Polygons : Concave Polygons Has one or more angles that are collapsed or dented in
Has an interior angle that measures more than 180º
Examples of Concave Polygons:
Convex Polygons : Convex Polygons All interior angles are less than 180º
Examples of Convex Polygons:
Concave and Convex Polygons : Concave and Convex Polygons http://www.mathopenref.com/polygonconvex.html
Student Polygon Video : Student Polygon Video