Tom Scavo's

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Tangrams are a puzzle that helps develop spatial-visualization skills, but they may also be used to introduce or reinforce geometrical concepts such as congruency, similarity, symmetry, and so forth. This unit for grades 4 through 6 uses tangrams to compute thearea of polygonswithout formulas. In the process of doing so, the termscongruentandsimilarare introduced.

Constructing Your Own Set of Tangrams

The Area of Tangram Pieces[answer sheet]

More Tangram Activities[answer sheet]

Other Tangram Resources

## Acknowledgments

- The
Math Forumgraciously provided the environment and resources that made this project possible. Sarah Seastone was especially helpful.

- Thanks to
Suzanne Alejandrefor a critical reading of the paper version of these lessons, valuable suggestions, and numerous pointers into the online literature.

- The lesson Constructing Your Own Set of Tangrams is modeled after the article "How to make the 7 pieces of a Tangram" by
Karen Tobler.

- My son,
Brian Scavo, produced a seemingly endless flow of geometric constructions using tangrams, some of which will be seen on these pages. Now if only I had time to convert more of Brian's cool drawings into computer images!

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Tom Scavo

7 August 1996