Curated OER
Exploring Characteristics of Triangles
Students draw triangles and explore the classification of each using the measures of interior angles and lengths of sides. They investigate the sum of the interior angles of various triangles and conjecture and prove the theorem: The...
Sophia Learning
Sophia: Sum of Angles in Polygons
This tutorial with video and slideshow components investigate the characteristics of polygons as well as how to calculate the interior and exterior angles of any polygon. It offers two PowerPoint presentations and two videos that feature...
Cuemath
Cuemath: Convex Shapes
A comprehensive guide for learning all about convex shapes with definitions, examples, and practice questions.
Texas Instruments
Texas Instruments: What's the Angle?
Students discover properties of interior and exterior angles of convex polygons using the TI-89 and Geometer's Sketchpad.
Texas Instruments
Texas Instruments: Investigating the Angle Sum Theorem of Polygons
This activity will allow students to use Cabri Jr. to find the sum of the measures of interior angles of convex polygons and visually see how the Interior Angle Sum Theorem works.
Other
Generalization
Learn how to construct convex polygons and the mathematical foundations of symmetry on this site.
CK-12 Foundation
Ck 12: Geometry: Interior Angles in Convex Polygons
[Free Registration/Login may be required to access all resource tools.] Find the sum of the interior angles of a convex polygon.
CK-12 Foundation
Ck 12: Interior Angles in Convex Polygons
[Free Registration/Login Required] Students will move the pentagon points to explore convex polygons. Click learn more to watch a video and click challenge me to answer a practice question.
Sophia Learning
Sophia: Classifying Polygons
This lesson explores the characteristics of various types of polygons. It includes two PowerPoint presentations that test students' understanding by grouping polygons in the correct categories.
CK-12 Foundation
Ck 12: Geometry: Polygons Study Guide
[Free Registration/Login may be required to access all resource tools.] This study guide focuses on polygons: convex vs concave, interior and exterior angles, and basic terminology for common polygons.
Math Open Reference
Math Open Reference: Convex Polygon
Learn about convex polygons with this handy reference guide. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.
University of Regina (Canada)
University of Regina: Math Central: Interior Angle Measure of a Polygon
This is a question response page from the University of Regina where one may find an algorithm for finding the number of degrees of any convex polygon.
The Math League
The Math League: Figures and Polygons
This website has basic definitions for most polygons, regular and irregular.
Other
Intersecting Convex Polygons the Algorithm
This site talks about how to check for the intersection of polygons. Computer programs calculating intersections are presented.