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PPT
Sophia Learning

Sophia: Triangle Interior Angles Practice: Lesson 5

For Students 9th - 10th
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."
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PPT
Sophia Learning

Sophia: Triangle Interior Angles Practice: Lesson 1

For Students 9th - 10th
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."
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PPT
Sophia Learning

Sophia: Using Triangles to Find the Sum of Interior Angles: Lesson 1

For Students 9th - 10th
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."
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Interactive
National Council of Teachers of Mathematics

Nctm: Illuminations: Angle Sums

For Students 9th - 10th
Students may use this computer applet to explore angle sums of triangle, quadrilaterals, pentagons and hexagons.
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Whiteboard
ClassFlow

Class Flow: Polygons

For Teachers 9th - 10th
[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.
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Handout
Free Math Help

Free Math Help: Exterior Angle of a Triangle

For Students 7th - 8th Standards
This tutorial discusses exterior angles of a triangle. Example problems with explanations are included.
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Unit Plan
Free Math Help

Free Math Help: Interior Angles of a Polygon

For Students 9th - 10th
The Geometry tutorial discusses interior and exterior angles of a polygon. Sample exercises with explanations are included.
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Whiteboard
ClassFlow

Class Flow: Parallel Lines and Angle Relationships

For Teachers 9th - 10th Standards
[Free Registration/Login Required] Explore the relationships between parallel lines and the rules of angle measurements.
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Whiteboard
ClassFlow

Class Flow: Linear Pair and Vertical Angle Discoveries

For Teachers 9th - 10th
[Free Registration/Login Required] In this Flipchart, students explore linear pairs and vertical angles. Students determine the measure of interior and exterior angles.
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Handout
Math Is Fun

Math Is Fun: Interior Angles

For Students 3rd - 5th Standards
Gives a clear definition and drawing of an interior angle of a polygon.
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Handout
Math Open Reference

Math Open Reference: Interior Angles of a Triangle

For Students 9th - 10th
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.
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Website
University of Regina (Canada)

University of Regina: Math Central: Interior Angle Measure of a Polygon

For Students 6th - 8th
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.