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# Introductory trigonometry (Years 9 and 10)

This module from the AMSI 'The Improving Mathematics Education in Schools (TIMES) project' is for teachers who wish to consolidate their content knowledge on the topic of trigonometry. There are sections that provide history and context for the topic, as well as exercises and examples of how to present and explain the concepts to students.

Year level(s) Year 9, Year 10
Audience Teacher, School Leader
Purpose Content knowledge
Keywords Trigonometry, ratio, sine, cosine, tangent, explicit teaching

## Curriculum alignment

Strand and focus Geometry
Topics Pythagoras and trigonometry
AC: Mathematics content descriptions
ACMMG223 Use similarity to investigate the constancy of the sine, cosine and tangent ratios for a given angle in right-angled triangles
ACMMG224 Apply trigonometry to solve right-angled triangle problems
ACMMG245 Solve right-angled triangle problems including those involving direction and angles of elevation and depression
ACMMG273 Establish the sine, cosine and area rules for any triangle and solve related problems
ACMMG274 Use the unit circle to define trigonometric functions, and graph them with and without the use of digital technologies