Sophia Learning
Sophia: Triangle Interior Angles Practice: Lesson 5
This lesson provides practice problems that involve the sum of the interior angles of triangles. It is 5 of 6 in the series titled "Triangle Interior Angles Practice."
Sophia Learning
Sophia: Triangle Interior Angles Practice: Lesson 1
This lesson provides practice problems that involve the sum of the interior angles of triangles. It is 1 of 6 in the series titled "Triangle Interior Angles Practice."
Sophia Learning
Sophia: Using Triangles to Find the Sum of Interior Angles: Lesson 1
This lesson demonstrates how to use triangles to determine the sum of the interior angles of a polygon. It is 1 of 5 in the series titled "Using Triangles to Find the Sum of Interior Angles."
National Council of Teachers of Mathematics
Nctm: Illuminations: Angle Sums
Students may use this computer applet to explore angle sums of triangle, quadrilaterals, pentagons and hexagons.
ClassFlow
Class Flow: Polygons
[Free Registration/Login Required] This is a lesson on interior and exterior angles of polygons. This has an interactive piece as well as an assessment piece.
Free Math Help
Free Math Help: Exterior Angle of a Triangle
This tutorial discusses exterior angles of a triangle. Example problems with explanations are included.
Free Math Help
Free Math Help: Interior Angles of a Polygon
The Geometry tutorial discusses interior and exterior angles of a polygon. Sample exercises with explanations are included.
ClassFlow
Class Flow: Parallel Lines and Angle Relationships
[Free Registration/Login Required] Explore the relationships between parallel lines and the rules of angle measurements.
ClassFlow
Class Flow: Linear Pair and Vertical Angle Discoveries
[Free Registration/Login Required] In this Flipchart, students explore linear pairs and vertical angles. Students determine the measure of interior and exterior angles.
Math Is Fun
Math Is Fun: Interior Angles
Gives a clear definition and drawing of an interior angle of a polygon.
Math Open Reference
Math Open Reference: Interior Angles of a Triangle
Learn about the interior angles of a triangle with this helpful reference tool. Provides a detailed definition and 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 you will find an algorithm for finding the number of degrees of any convex polygon.