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Math: Geometry: Similarity and Congruence Discuss this eTheme.

These web sites are about the geometric concepts of similarity and congruence. Learn about postulates and theorems related to these concepts, and practice proving similarity or congruence. There are tutorials, quizzes, videos, interactive features, printable worksheets, and lesson plan ideas.

Grades

  • 6,
  • 7,
  • 8

Links

Click through this short lesson to read an overview of similarity, see examples, and take a practice quiz. NOTE: This site contains ads.
Click through this short lesson to read an overview of congruence, see examples, and take a practice quiz. NOTE: This site contains ads.
This page explains and defines congruent triangles and provides examples. There is a review quiz at the bottom of the page.
Sal Khan gives a demonstration of congruent triangles and the SSS postulate in this video. NOTE: This site includes a message board.
Sal Khan gives a demonstration of similarity in triangles in this video. NOTE: This site includes a message board.
This page explains and defines similar polygons and provides examples. When you are finished reading, you can take the quiz.
Click through this tutorial on similar or congruent shapes, how to prove congruence, and how to calculate similar areas or volumes. When you have read all of the pages you can take a review test. NOTE: The site includes ads and leads to a discussion board.
In this lesson, students can learn the formal proofs for proving whether triangles are similar or congruent or not.
This lesson plan includes several activities on congruent and similar triangles. The page provides teachers with a prediction guide as students' warm-up exercises before the activities, worksheets with keys, and helpful guidelines.
This seven-page Microsoft Word document is a lesson plan based on hands-on activities that involve group of students to construct various congruent triangles.
Play the game and brush up on what you learned about congruent and similar triangles.
Watch an animated movie with Tim and Moby and find out how similar triangles are used for indirect measurements. NOTE: Site available by subscription only.

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