National Council of Teachers of Mathematics
Nctm: Figure This: Envelopes
Explore tessellations with real world applications in this activity from the NCTM Math Challenges for Families series. Figure out what shape you would use to create a legal envelope from a single sheet of paper. Then discover how...
Doina Popovici
Math Play: Types of Polygons
Identify the polygon based on clues in this online game.
Doina Popovici
Math Play: Polygon or Not? This Is the Question
An online game where students have to decide whether a shape is a polygon or not.
Other
Intersecting Convex Polygons the Algorithm
This site talks about how to check for the intersection of polygons. Computer programs calculating intersections are presented.
Rice University
Rice University: Cynthia Lanius: Hidden Polygon Activity
On this site students are instructed to locate different types of polygons on triangle grid paper. This page can be printed so that students can actually draw them. It also gives a definitions link for each polygon.
Calculator Soup
Calculator Soup: Rectangle Calculator
Use this calculator if you know 2 values for the rectangle, including 1 side length, along with area, perimeter, or diagonals and you can calculate the other 3 rectangle variables. A square calculator is a special case of the rectangle...
Calculator Soup
Calculator Soup: Regular Polygon Calculator
Use this calculator to calculate properties of a regular polygon. Enter any 1 variable plus the number of sides or the polygon name. Calculates side length, inradius, circumradius, area, and perimeter.
Math Open Reference
Math Open Reference: Center of a Polygon
A complete reference guide to the center of a polygon. It provides definitions and an interactive activity that enhances further explanation. Includes links to related topics.
National Council of Teachers of Mathematics
The Math Forum: Plane Figure
This site provides a definition for plane figure (at the top of the page) and a few examples.
Curated OER
Edu place.com: Identifying and Classifying Polygons
This site describes intoductory elements on polygons and their properties.
Curated OER
Ear Cutting for Simple Polygons: Introduction
This site gives the definitions for various polygon-related material.
Curated OER
Ear Cutting for Simple Polygons: Introduction
This site gives the definitions for various polygon-related material.