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Handout
Merriam-Webster

Merriam Webster: Dictionary Illustration: Types of Triangles

For Students 3rd - 8th Standards
A labeled illustration of six different types of triangles.
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Interactive
Math Is Fun

Math Is Fun: Interactive Triangles

For Students 9th - 10th Standards
This is an excellent tool for students to explore how changes in the size of a triangle's sides or angles affect its appearance. Different types of triangles and angles are presented.
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eBook
Math Planet

Math Planet: Pre Algebra: Triangles

For Students 9th - 10th Standards
Learn about the types of triangles by taking a look at an example and a video lesson.
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Handout
Oswego City School District

Regents Exam Prep Center: Triangle Information

For Students 6th - 8th Standards
This Oswego City School District site from the Regents Exam Prep Center provides an explanation of the classifications of triangles both by sides and by angles. Pictures are also included.
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Article
Mocomi & Anibrain Digital Technologies

Mocomi: Types of Triangles

For Students 2nd - 8th Standards
Explore the different types of triangles and other properties.
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Unit Plan
Math Open Reference

Math Open Reference: Triangles

For Students 9th - 10th Standards
A complete reference guide to types of triangles and triangle perimeter and area. It provides definitions and interactive animated activities that enhance further explanation.
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Whiteboard
ClassFlow

Class Flow: Classifying Triangles

For Teachers 5th - 8th Standards
[Free Registration/Login Required] This lesson covers methods of classifying triangles, both according to the length of their sides and by the measure of their interior angle.
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Whiteboard
ClassFlow

Class Flow: Understanding Basic Triangles

For Teachers 3rd - 5th Standards
[Free Registration/Login Required] This lesson presents an introduction to triangles and the methods of identifying them. It includes opportunities for students to interactively identify triangles. It also includes: assessment questions...
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Handout
Oswego City School District

Regents Exam Prep Center: Geometry Vocabulary Resources

For Students 9th - 10th
A list of geometry definitions and a matching activity.
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Unknown Type
Other

Mathematics Internet Library: Free Internet Books

For Students K - 1st Standards
Practice problem worksheets are available for learners needing to study basic terms relating to triangles and other math concepts.
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Activity
Texas Instruments

Texas Instruments: Try Angle?

For Teachers 6th - 8th Standards
In this activity, students investigate properties of triangles by randomly generating possible side lengths for triangles. They learn to determine if three line segments can form a triangle. They also learn to classify triangles as...
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Handout
The Math League

The Math League: Figures and Polygons

For Students 9th - 10th Standards
This site provides definitions of different types of polygons and figures.
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Handout
The Math League

The Math League: Figures and Polygons

For Students 3rd - 8th Standards
This website has basic definitions for most polygons, regular and irregular.

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