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US Patent Number: 5,873,729
Grades k-12 - Trigram is a set of 9 similar right triangles: 1 large, 3 medium and 5 small triangles that form a near square rectangle as shown above. The Trigram is 2 different products. The manipulative and a teacher book to introduce and teach trigonometry concepts in middle and high school through hands-on activities. The manipulative and a small booklet of Tangram type puzzle shapes that can be constructed with the pieces. To get more information about current or future manipulatives, inventions & curriculum programs contact: