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Geometry: Similarity and Proportion Classroom ActivitiesDownload
Geo_Angles_and_Similarity_sm

Angles and Similarity

Experiment with the measures of the angles of similar triangles to determine conditions necessary for two triangles to be similar.
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    TI-Nspire™ CX/CX II
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Applications of Similar Figures

Students will identify corresponding parts of figures and use the definition of similar figures to solve real-world applications involving rectangles and triangles.
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    TI-Nspire™ CX/CX II
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    TI-Nspire™ CX CAS/CX II CAS
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Geo_Corresponding_Parts_Similar_Triangles_sm

Corresponding Parts of Similar Triangles

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Change the scale factor (r) between similar triangles; identify the corresponding parts and establish relationships between them.
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    TI-Nspire™ CX/CX II
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    TI-Nspire™ CX CAS/CX II CAS
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Nested Similar Triangles

Discover the conditions that make triangles similar by moving the sides opposite the common angle in nested triangles.
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    TI-Nspire™ CX/CX II
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    TI-Nspire™ CX CAS/CX II CAS
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12365 Ratios_of_Similar_Figures

Ratios of Similar Figures

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Students explore the ratio of perimeter, area, surface area, and volume of similar figures in two and three dimensional figures.
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    TI-Nspire™ CX/CX II
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    TI-Nspire™ CX CAS/CX II CAS
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Scale Factor Area Perimeter

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Explore the relationship of perimeter and area in similar triangles when the scale factor is changed.
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    TI-Nspire™ CX/CX II
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Similar Figures

Similar Figures

Observe what happens to ratios of pairs of side of rectangles and triangles.
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    TI-Nspire™ CX/CX II
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    TI-Nspire™ CX CAS/CX II CAS
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Triangle_Midsegments

Triangle Midsegments

Investigate the relationships between a triangle and the similar triangle formed by one of the triangle's midsegments.
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    TI-Nspire™ CX/CX II
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    TI-Nspire™ CX CAS/CX II CAS
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