Abstract
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.
Margaret Kendal and Kaye Stacey
Trigonometry: Comparing Ratio And Unit Circle Methods