TRIGONOMETRY: COMPARING RATIO AND UNIT CICLE METHODS
Margaret Kendal and Kaye Stacey[i]
Before
the 1960s, introductory trigonometry was taught in Victorian schools using the
ratio method, where trigonometric functions are defined as ratios of sides of
right angled triangles. With the advent of "new maths",
the unit circle method was introduced. This study explored differences between
the two methods for teaching introductory trigonometry. Eight classes of
students were randomly allocated to either teaching method. The ratio method
was found to be much more effective, resulting in better performance and
retention in trigonometry and algebra, and more favourable
attitudes.
[i]We wish to thank the students and teachers of