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Unit Plan
Khan Academy

Khan Academy: Identify Triangles by Angles

For Students 3rd - 5th Standards
Practice identifying triangles by their angles as acute, right, or obtuse. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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Interactive
Quia

Quia: Introduction to Angles

For Students 3rd - 8th Standards
Use this website to practice angle definitions using a matching game format.
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Interactive
Quia

Quia: Introduction to Angles Flashcards

For Students 3rd - 8th Standards
Use this website to practice angle definitions using a flash card format.
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Interactive
Quia

Quia: Introduction to Angles Concentration

For Students 3rd - 8th Standards
Use this website to practice angle definitions using a concentration game format.
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Interactive
Quia

Quia: Introduction to Angles: Word Search

For Students 3rd - 8th Standards
Use this website to practice angle definitions using a word search format.
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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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Unit Plan
Khan Academy

Khan Academy: Angle Types

For Students 3rd - 5th Standards
Determine if an angle is acute, right, or obtuse. A protractor is provided. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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Handout
Wolfram Research

Wolfram Math World: Cut the Knot! Angles

For Students 9th - 10th Standards
Very good site with links to reviews of various angles.
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Activity
Texas Instruments

Texas Instruments: Classifying a Triangles by Their Angle Measure Using Cabri Jr

For Teachers 9th - 10th
This activity uses Cabri Jr to classify triangles according to their angle measure. [Requires Adobe Reader.]
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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
Beacon Learning Center

Beacon Learning Center: Triangles Side by Side

For Students 3rd - 8th Standards
This comprehensive web lesson describes how to classify triangles by their angle and side measurements. It provides real-world examples and exercises for students to practice the skill.
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Activity
Beacon Learning Center

Beacon Learning Center: Anglemania!

For Students 3rd - 5th Standards
Students explore four types of angles in this interactive web lesson.
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Activity
Varsity Tutors

Varsity Tutors: Hotmath: Algebra Review: Angle Basics

For Students 9th - 10th Standards
Find a quick, concise explanation of angles and types of angles. Several examples are given to help you understand how angles are formed and the different types of angles.
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Whiteboard
ClassFlow

Class Flow: Angles

For Teachers 3rd - 5th Standards
[Free Registration/Login Required] Practice identifying different types of angles in this flipchart. See examples of the different angles.
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Whiteboard
ClassFlow

Class Flow: Angle Facts

For Teachers 9th - 10th Standards
[Free Registration/Login Required] This lesson is a thorough review of all types of angles (e.g. obtuse, right, scalene, isosceles, equilateral, alternate) with wonderful diagrams to reinforce thinking skills.
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Whiteboard
ClassFlow

Class Flow: All About Angles

For Teachers 3rd - 5th Standards
[Free Registration/Login Required] This flipchart gives an introduction to angles, reading a protractor, naming and classifying angles. It also includes opportunities to practice these skills. The lesson is aligned with the 5th grade...
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Lesson Plan
OER Commons

Oer Commons: Classifying Triangles

For Teachers 6th - 8th Standards
In this lesson, learners learn to classify triangles by the size of the angles and the measures of the sides. Students will use interactives to explore equilateral, isosceles, scalene, acute, obtuse, and right triangles. Included are...
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eBook
Mathigon

Mathigon: Geometry: Triangles and Trigonometry: Properties of Triangles

For Students 9th - 10th Standards
This lesson focuses on the properties of triangles, a closed shape that has three sides, three vertices, and and three internal angles. There are different types of triangles such as a right triangle, obtuse, and acute based on the...
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Activity
Homeschool Math

Homeschool Math: Triangles

For Students 3rd - 8th Standards
This lesson plan provides students with an opportunity to practice drawing and measuring triangles and angles. It also shows pictures and gives definitions of each type of angle and triangle.
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Unit Plan
Oswego City School District

Regents Exam Prep Center: Area of a Triangle and Parallelogram Using Trig

For Students 9th - 10th Standards
How can trigonometry be used to find the area of a triangle or parallelogram? Does the triangle need to be a right triangle, and how accurate can the results possibly be? The answers to these questions are found here along with several...
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Activity
University of Saskatchewan (Canada)

University of Saskatchewan: Trigonometric Functions

For Students 9th - 10th Standards
This site examines the six trigonometric functions from a right triangle point of view. Provides information, examples, and lots of exercises for understanding.
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Unknown Type
Mr. Martini's Classroom

Mr. Martini's Classroom: Basic Geometry: Points, Lines, and Angles

For Students 3rd - 6th Standards
Students can review basic geometric terms using these self-check, multiple choice questions. Three levels of questions are provided.
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Unit Plan
Khan Academy

Khan Academy: Area of Triangles

For Students 5th - 7th Standards
Practice finding the area of right, acute, and obtuse triangles. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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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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