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What is similarity?

The first of a series of lessons that explores the meaning of similarity and how a shape can be translated to prove they are similar. The following lessons demonstrate the shortcuts and rules for testing and proving similarity of plane shapes.

Resource details
Year level
Year 9
Purpose
Teaching resource Student activities
Strand
Space
Topic
Angles and geometric reasoning
Audience
Teachers
Format
Webpage
Australian Curriculum code
AC9M9M03
Numeracy progression
Understanding geometric properties (P7) Proportional thinking (P7) Understanding units of measurement (P10)
Publisher
Illustrative Mathematics
Copyright
© Open Up Resources/Illustrative Mathematics. Creative Commons BY 4.0.
Keywords
transformation ratio triangle angle proof congruent scale factor enlargement transformation