Method and apparatus for teaching relationship of trigonometric

Details Method and apparatus for teaching relationship of trigonometric Method and apparatus for teaching relationship of trigonometric

1998-12-23

2000-10-17

Nguyen, Kien T.

Education and demonstration

Mathematics

Geometry, trigonometry, or physical mathematic model structure

434214, 434215, 434216, G09B 2302, G09B 2304

Patent

active

061322172

ABSTRACT:
A method and apparatus for teaching a relationship of trigonometric functions between a unit circle and a rectangular coordinate system has a primary flexible member movable between a circular configuration defining the unit circle, and a straight configuration defining the rectangular coordinate system. A plurality of secondary linear members are removably coupled at attachment points along the flexible member. The linear members are movable with the flexible member between a unit circle position and a rectangular coordinate position. In the unit circle position, each linear member is oriented with respect to the unit circle to demonstrate and represent a trigonometric function. In the rectangular coordinate position, each linear member extends perpendicularly from the flexible member defining trigonometric wave forms. The flexible member and linear members physically represent the trigonometric functions and moving the members between the two systems demonstrates the relationship between them. The flexible member and linear members may be disposed on a base with an upper surface. A circular wall may be provided to form the flexible member into the circular configuration.

REFERENCES:
patent: 5114347 (1992-05-01), Camp
Cuisenaire Dale Seymour Publications, 1998 Product Catalog, pp. 55-56.
Jonathan Shear, "Visual Thinking, Algebraic Thinking, and a Full Unit-Circle Diagram," Mathematics Teacher, Oct. 1985.

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