Aklan State University

College of Teacher Education

Graduate Studies Program

Banga, Aklan

POLYGONS

Objectives

• Define, identify and illustrate different kinds of polygons according to the number of sides
• Identify the parts of a regular polygon: interior, exterior and the points on the polygon itself.
• Differentiate convex from non-convex polygons.

 What is a polygon?

• A closed plane figure formed by fitting together segments end to end with each segment intersecting exactly two others
• Each line segment is called a side of a polygon.
•   Each endpoint where the sides meet is called the vertex of the polygon.
•  Classified according to the number of its sides.

 Classification of Polygons

  How to name a polygon?

• To name a polygon, the vertices are listed in consecutive order.

What are the parts of a polygon?

• Interior of the polygon
• Exterior of the polygon
• Points on the polygon itself

What is the difference between convex and concave polygons?

• A polygon is convex if no diagonal is in the exterior of the polygon.
• A polygon is concave if at least one diagonal is in the exterior of the polygon.

 Summary

    •       A polygon is a closed plane figure formed by fitting together segments end to   end with each segment intersecting exactly two others.
    •       It is classified according to the number of its sides.
    •       The parts of a polygon are: the interior, the exterior and the points on the           polygon itself.
    •       A polygon may be convex or concave.

Reference:

           Nivera, G. (2012). Grade 7 Mathematics: Patterns and practicalities. Makati City: SalesianaBOOKS by Don Basco Press, Inc.

Prepared by:

             Hanna M. Repaz         MAEd - Mathematics