Please note: This site contains links to websites not controlled by the Australian Government or ESA. Read more in the Terms of Use.
Four scalene triangles inquiry
This prompt is a way of introducing the cosine rule for finding the angles in a scalene triangle. The resource includes classroom examples, teacher notes and guided questions, as well as alternative, extending prompts.
- Resource details
- Year level
- Year 9
- Purpose
- Assessment tasks Student activities Teaching resource
- Strand
- Space
- Topic
- Pythagoras and trigonometry
- Audience
- Teachers
- Format
- Downloadable resource
- Australian Curriculum code
- AC9M9SP01
- Numeracy progression
- Understanding geometric properties (P7) Proportional thinking (P7)
- Publisher
- Inquiry Maths
- Copyright
- © Andrew Blair 2012-21. Creative Commons BY-NC-SA 4.0.
- Keywords
- cosine ratio
Related resources
-

Mathematical modelling: The steepest slopes on Baldwin St
Students investigate steepness using Baldwin Street, representing gradient in multiple ways, linking it to tangent, and communicating findings for real audiences.
Resource details -

WS02 - Cylinder volume
Use this work sample to guide assessment of students' knowledge and skills in applying formulas to solve problems involving the surface area and volume of cylinders.
Resource details -

reSolve: Geometry – lunch lap (Trial)
Two inquiry-based lessons where students are challenged to use Pythagoras' theorem to optimise the path of a lunch cart.
Resource details -

reSolve: Mathematical modelling – cornering
This series of inquiry-based lessons uses properties of circles, trigonometry and Pythagoras' theorem to investigate how long vehicles 'cut corners' when cornering.
Resource details -

Trigonometry
This resource focuses on the origins of trigonometrical ratios.
Resource details -

Pythagoras and trigonometry (Measurement): Year 9 – planning tool
This planning resource for Year 9 is for the topic of Pythagoras and trigonometry.
Resource details -

Pythagoras and trigonometry (Space): Year 9 – planning tool
This planning resource for Year 9 is for the topic of Pythagoras and trigonometry.
Resource details -

Right-angled triangles inquiry
This inquiry makes a connection between Pythagoras and trigonometry.
Resource details