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Scalene triangles

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.

Additional details

Year level(s) Year 9
Audience Teacher
Purpose Assessment task, Extension, Student task, Teaching resource
Format Downloadable resources
Teaching strategies and pedagogical approaches Collaborative learning, Differentiated teaching, Explicit teaching, Feedback, Mathematics investigation
Keywords scalene, triangle, trigonometry, cosine rule, angles

Curriculum alignment

Curriculum connections Critical and creative thinking, Numeracy
Strand and focus Space, Build understanding, Apply understanding
Topics Pythagoras and trigonometry
AC: Mathematics (V9.0) content descriptions
Recognise the constancy of the sine, cosine and tangent ratios for a given angle in right-angled triangles using properties of similarity

Numeracy progression Understanding geometric properties (P7)
Proportional thinking (P7)

Copyright details


Inquiry Maths


© Andrew Blair 2012-21. Creative Commons BY-NC-SA 4.0.