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.
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.
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.