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Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Determining the Length of an Unknown Side of a Triangle

For Students 3rd - 5th Standards
[Free Registration/Login may be required to access all resource tools.] Students watch a video tutorial and attempt practice problems on how to determine the unknown side length of a triangle.
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eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 1.4 Triangles

For Students 9th - 10th Standards
Explore and measure a variety of triangles.
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Handout
Quia

Ixl Learning: Types of Triangles

For Students 3rd - 5th Standards
Brush up on your math skills relating to the types of triangles then try some practice problems to test your understanding.
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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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Unknown Type
Math Open Reference

Math Open Reference: Triangle Quiz

For Students 6th - 8th Standards
Students are assessed on different types of triangles. Definitions of the triangles are included.
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Unknown Type
McGraw Hill

Glencoe Mathematics: Online Study Tools: Triangles and Angles

For Students 9th - 10th Standards
This site gives a short interactive quiz which allows students to self-assess their understanding of the concept of triangles and angles.
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Activity
AAA Math

Aaa Math: Types of Triangles Based on Sides

For Students 3rd - 5th Standards
Students can practice classifying triangles based on side lengths through a series of self-check exercises and timed learning games.
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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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Lesson Plan
Alabama Learning Exchange

Alex: A Triangle to Remember

For Teachers 4th Standards
This lesson will introduce students to different types of triangles by using a clip from the movie A Walk to Remember. They will take part in interactive tutorials to strengthen the concepts of classifying triangles. The students will...
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Activity
National Council of Teachers of Mathematics

The Math Forum: Problems Library Geometry Triangles

For Students 9th - 10th Standards
This site contains a wealth of problems that deal with the basic definitions of medians, altitudes, angle bisectors, and perpendicular bisectors or the defining characteristics of the different types of triangles. There are also...
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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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Activity
Other

Ic Teachers: Shapes: Triangles

For Students 6th - 9th Standards
Are you looking for a very basic website that will explain the basic properties of a triangle? Use this site to learn about the properties of equilateral triangles, isosceles triangles, right triangles,and scalene triangles. There are...
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Unit Plan
Wolfram Research

Wolfram Mathworld: Isosceles Triangle

For Students 9th - 10th
MathWorld explains what an isosceles triangle is and how it compares with equilateral, and scalene triangles. The altitude and area of these triangles are also discussed.
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Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Classifying Triangles Within Composite Figures

For Students 3rd - 5th Standards
[Free Registration/Login may be required to access all resource tools.] In this learning module, students are presented with a composite figure and must identify the types of triangles within it. An accompanying video demonstrates a...
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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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Unit Plan
Math Is Fun

Math Is Fun: Right Angled Triangles

For Students 9th - 10th Standards
The resource investigates right triangle. Topics explored are isosceles, scalene, and 3,4,5 triangles. Examples, illustrations, and definitions are 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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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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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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Unit Plan
Khan Academy

Khan Academy: Identify Triangles by Side Lengths

For Students 3rd - 5th Standards
Practice identifying triangles by their side-lengths as equilateral, isosceles, or scalene. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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PPT
Sophia Learning

Sophia: Scalene, Isosceles, and Equilateral Triangles: Lesson 1

For Students 9th - 10th Standards
This lesson will define scalene, isosceles, and equilateral triangles. It is 1 of 5 in the series titled "Scalene, Isosceles, and Equilateral Triangles."
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Activity
Illustrative Mathematics

Illustrative Mathematics: 4.g Lines of Symmetry for Triangles

For Teachers 3rd - 5th Standards
The division of triangles into scalene, isosceles, and equilateral can be thought of in terms of lines of symmetry. Aligns with 4.G.A.3.
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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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