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Math: Geometry: Angles and Triangles

Learn about angles and triangles. See examples of acute, obtuse, and right angles as well as equilateral, isosceles, and scalene triangles. Find out several rules of angles, triangles, and Pythagorean Theorem. Includes classroom activities, quizzes, and animated movies on triangles. There is a link to an eThemes Resource on shapes.


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Practice recognizing types of triangles based on their angles measurements. Click on the "Next Lesson" link at the top to practice recognizing triangles by their sides' lengths and finding an angle.
This site has extensive explanations of angles and triangles. Follow the links to view glossary definitions and see proofs of different theorems.
Read the definitions for the different types of angles and triangles, then try labeling the diagram. Click on "Answers" to see how you did. NOTE: The site includes ads.
This printable worksheet has students identify what types of angles are shown.
Students can practice measuring these angles.
Watch three animated movies to learn about "Measuring Angles", "Types of Triangles", and "Similar Triangles". Choose these movies from the table and don't forget take quizzes and view fun activities. NOTE: The web site is available by subscription only.
Click on the "Pythagorean Theorem" icon to watch a movie and learn how the theorem works. NOTE: The web site is available by subscription only.
Learn the different types of triangles and what type of angles they have. NOTE: The site includes pop-up and banner ads.
This student-created site has descriptions of the isosceles and equilateral triangles followed by an interactive quiz. Click on the "Special Triangles" link at the left to learn two theorems of right isosceles triangles. NOTE: The site has a link to a message board.
This site takes you step-by-step through the different types of triangles. NOTE: The site includes ads.
Try to identify these different types of triangles.
This lesson plan from a Missouri teacher has students design furniture using triangles and other shapes.
This table game can help kids to learn how to identify different types of triangles.
Test your knowledge of triangles and point out what is wrong with triangles on this page.
This classroom activity has students use triangles and rectangles to make patterns.
These sites are about shapes including quadrilaterals and polygons. Includes definitions and examples of them in everyday life. There are interactive sites with games, manipulatives, and animated movies.

Education Standards


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