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Similarity (Geometry) — Study and Teaching
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1.

Similarity [electronic resource]

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Examines intuitive notions of what makes a "good copy", then progreses toward a more formal definition of similarity. Explores similar triangles and applications of similar triangles, including trigonometry.
Online
2003
2.

Proportionality and Similar Figures: Discovery [electronic resource]

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Explains what makes similar figures similar and how a scale factor affects side lengths, angles, perimeters, and areas when figures are enlarged or reduced.
Online
2000
3.

Proportionality and Similar Figures: In Practice [electronic resource]

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The teachers discuss how their students approached the proportionality lessons. They evaluate their students' work as a way to strengthen their instructional practice, and create a new lesson based on their assessments.
Online
2000