Geometry: similarity Image

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Geometry: similarity

In this unit, students use dilations and rigid transformations to justify triangle similarity theorems. The unit balances a focus on proof with a focus on using similar triangles to find unknown side lengths and angle measurements.

Additional details

Year level(s) Year 9
Audience Teacher
Purpose Content knowledge, Teaching resource, Student task
Teaching strategies and pedagogical approaches Explicit teaching
Keywords Transformation, Ratio, Triangle, Angle, Proof, Congruent, Similar, Scale factor, Enlargement

Curriculum alignment

Curriculum connections Critical and creative thinking, Numeracy
Strand and focus Space
Topics Angles and geometric reasoning
AC: Mathematics (V9.0) content descriptions

Solve spatial problems, applying angle properties, scale, similarity, Pythagoras' theorem and trigonometry in right-angled triangles

Numeracy progression Understanding geometric properties (P7)
Proportional thinking (P7)
Understanding units of measurement (P10)

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