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Extending a (TIMSS) Japanese Lesson Using Trigonometry

David Pagni, Harris Shultz 

March 1999, Volume 92, Issue 3, Page 189

Abstract:
One of the Japanese mathematics lessons reported in the Third International Mathematics and Science Study (TIMSS) involves the concept of the area of a triangle. On the first day, students explore the area of triangles obtained by using the same base but translating the vertex opposite the base along a path parallel to the base, thus keeping the height constant. The next day the students are reminded of that property and are given a challenging problem that applies the property.

Keywords:
Trig Functions
Article
Angles
Grades 9-12
Teacher