Article
Mocomi & Anibrain Digital Technologies

Mocomi: Types of Triangles

For Students 2nd - 8th Standards
Explore the different types of triangles and other properties.
Handout
Varsity Tutors

Varsity Tutors: Hotmath: Algebra Review: Types of Triangles

For Students 9th - 10th Standards
Find a quick, concise explanation of the different types of triangles. Examples are given and clearly explained.
Activity
AAA Math

Aaa Math: Types of Triangles Based on Angles

For Students 3rd - 5th Standards
Students can practice classifying triangles based on angle measurements through a series of self-check exercises and timed learning games.
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.
Unit Plan
National Council of Teachers of Mathematics

The Math Forum: Triangle Formulas

For Students 9th - 10th
Investigate the geometric definitions of triangles, focusing upon equilateral, isosceles, right, and scalene with detailed drawings and appropriate formulas for each. This site has links to more information on triangles.
Handout
CK-12 Foundation

Ck 12: Geometry: Triangle Relationships Study Guide

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] This study guide reviews terminology for triangles, triangle properties, different types of triangles, and interior and exterior angle theorems.
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.
Unknown Type
Soft Schools

Soft Schools: Types of Triangles Quiz

For Students 9th - 10th Standards
The problems on this quiz give descriptions and properties of specific triangles. Students are expected to read the information and identify the triangle that is being described.
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.
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...
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Triangle Classification by Angles

For Students 6th
[Free Registration/Login may be required to access all resource tools.] Classify different types of triangles by their angles.
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...
Unit Plan
Cuemath

Cuemath: Triangles

For Students 5th - 8th Standards
Explore everything about triangles. Learn about the different types, important properties, and how to find its area and perimeter. Check out the solved examples and interactive questions for better understanding.
Handout
CK-12 Foundation

Ck 12: Geometry: Special Right Triangles Study Guide

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] Different types of right triangles and trigonometric ratios for special right triangles are covered in this study guide.
Unit Plan
E-learning for Kids

E Learning for Kids: Math: Dojo: Polygons and Time Zones

For Students 5th - 6th
Students will play several learning games to explore polygons such as triangles, and how to determine the area of triangles and the different types of triangles. They will also explore time zones.
Unit Plan
E-learning for Kids

E Learning for Kids: Math: Group of Pyramids: 2 D Shapes

For Students 4th - 6th
Abeni works at the pyramids. Visit her and find out more about circles and triangles.
Handout
Science Struck

Science Struck: List of Different Types of Geometric Shapes

For Students 4th - 8th Standards
A comprehensive list of 2D shapes and 3D solids with everything from a triangle to a dodecahedron. Includes illustrations and short descriptions of attributes for each.
Lesson Plan
Crayola

Crayola: Exploring Triangles.

For Teachers 9th - 10th
Here's a great geometry activity to display learners' knowledge of the different types of triangles. Provides resources and adaptations to supplement this lesson. (To access this lesson plan, you must register with Crayola.com....
Unit Plan
Cuemath

Cuemath: Altitude of a Triangle

For Students 9th - 10th Standards
Explore the world of the altitude of a triangle in this mini-lesson including its definition, altitudes in different types of triangles, formulae, some solved examples, and a few interactive questions for you to test your understanding.
Unit Plan
Cuemath

Cuemath: Obtuse Triangle

For Students 9th - 10th Standards
In this mini-lesson, learn about obtuse triangles including the obtuse triangle definition, sides, properties, examples, and other fun facts related to it.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Triangle Classification by Side Lengths

For Students 6th
[Free Registration/Login may be required to access all resource tools.] Classify different types of triangles by their side lengths.
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.
Unit Plan
CK-12 Foundation

Ck 12: Trigonometry: Law of Sines

For Students 10th - 12th Standards
[Free Registration/Login may be required to access all resource tools.] Learn how to use the Law of Sines with different types of triangles.
Unit Plan
CK-12 Foundation

Ck 12: Geometry: Triangle Classification Grades 8 10

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Classify triangles by side lengths and angle measures.

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