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Unit Plan
CK-12 Foundation

Ck 12: Trigonometry: Pythagorean Theorem to Classify Triangles

For Students 10th - 12th Standards
[Free Registration/Login may be required to access all resource tools.] Use the Pythagorean Theorem to determine if triangles are acute, obtuse, or right triangles.
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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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Lesson Plan
OER Commons

Oer Commons: Classifying Triangles

For Teachers 6th - 8th Standards
In this lesson, students 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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Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Classifying Right Obtuse or Acute by Angle Measure

For Students 3rd - 5th Standards
[Free Registration/Login may be required to access all resource tools.] Students watch a video and attempt practice problems on how to classify triangles based on angle measures.
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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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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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Unit Plan
CK-12 Foundation

Ck 12: Converse of the Pythagorean Theorem

For Students 7th - 9th Standards
[Free Registration/Login may be required to access all resource tools.] Learn about the converse of the Pythagorean Theorem and some of its applications. Also explains how to identify acute and obutse triangles through the use of the...
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Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Co Classifying Triangles

For Teachers 9th - 10th Standards
The goal of this task is to help students synthesize their knowledge of triangles where only two of the vertices have been given. They will need to know that a triangle inscribed in a circle, with a diameter of the circle as one side, is...
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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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Lesson Plan
Oswego City School District

Regents Exam Prep Center: Angles and Triangles

For Teachers 9th - 10th Standards
On this site a viewer can learn about the different types of triangles, and categorized by either angles or sides. Tutorials are also included for interior and exterior angles of triangles. A teacher resource page includes a lesson plan...
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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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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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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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Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Classifying All Types of Triangles by Lengths of Sides

For Students 3rd - 5th Standards
[Free Registration/Login may be required to access all resource tools.] Students watch a video overview and attempt practice problems on classifying triangles based on length of sides.
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Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Classifying Triangles by Identifying the Number of Equal Sides

For Students 3rd - 5th Standards
[Free Registration/Login may be required to access all resource tools.] Students watch a video overview and attempt practice problems on classifying triangles based on the number of equal sides.
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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
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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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 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.
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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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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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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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Professional Doc
Louisiana Department of Education

Louisiana Doe: Louisiana Believes: Eureka Math Parent Guide: Angle Measure and Plane Figures

For Students 4th Standards
A guide to support parents as they work with their students in angle measure and plane figures.
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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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