Trigonometry and Algebra
Hands-on Trigonometry Proofs - New in 2008!
This set contains four separate "proofs" of trigonometry relations, with examples of a Pythagorean identity, a sum formula, a double-angle formula, and two sum-to-product formulas:
Demonstration of each relation is accomplished by physically rearranging the pieces to establish equalities of areas or lengths. These are not rigorous mathematical proofs, but rather visual common-sense proofs. As such, they help make these abstract relationships real and believable. By actually handling the pieces, students engage their minds to a greater degree than they would by merely looking at the proofs on paper. The color instructions describe how each proof is demonstrated, and four reproducible worksheets reinforce the material. Contains 20 magnetic foam pieces. Grades 7-12.
Item no. 3511. Suggested retail price: $24.95.
"I showed Hands-On Trigonometry Proofs to one of
the students that works as a tutor
in our Math Skills Center, and, in her words "Gee, That's
really neat!" And I agree.
I also showed them to this semester's instructor in
our pre-calc class, she liked them too."
- Roger Nelsen, Professor of Mathematics, Lewis and Clark College.
Author of "Proofs without Words" and "Proofs without Words II"
VisuAlgebra BlocksTM
This set contains foam blocks that can be used to visually demonstrate four basic algebra relations:
This set uses area and volume to represent terms that are the product of two and three quantities, respectively. The edge lengths of the blocks are labeled in terms of a and b to help students relate the areas and volumes to terms in the above relations. Color instructions describe the use of the blocks to demonstrate these relations. Four reproducible worksheets guide students in the use of the blocks, including measuring and calculating areas and volumes to provide concrete demonstrations of these relations. Contains 12 blocks made from soft, durable, and nontoxic foam. Blocks measure 1" - 3" on a side. Grades 7-12.
Item no. 3411. Suggested retail price: $29.95.
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