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- HSG-SRT.A.1Verify experimentally the properties of dilations given by a center and a scale factor:
- HSG-SRT.A.2Given two figures, use the definition of similarity in terms of similarity transformations to decide if they are similar; explain using similarity transformations the meaning of similarity for triangles as the equality of all corresponding pairs of angles and the proportionality of all corresponding pairs of sides.
- HSG-SRT.A.3Use the properties of similarity transformations to establish the AA criterion for two triangles to be similar.

Transformations + Similarity

Geometry

» Unit:

Sweet Similar Shapes

Big Idea:Students will use a pair-share activity and activate their prior knowledge to discover how transformations connect to AA criterion.

2 Triangles in 1

Geometry

» Unit:

Sweet Similar Shapes

Big Idea:Students will complete a discovery activity to uncover key properties of similar triangles and apply knowledge of AA criterion.

Error Analysis: Finding Sides of Similar Triangles

Geometry

» Unit:

Similar Figures

Big Idea:Student examine common errors made in setting up and solving for missing sides of similar triangles.

Proving that Triangles are Similar

Geometry

» Unit:

Similar Figures

Big Idea:Similar triangle proofs, made easy and understandable!

Discovering Similar Triangles

Geometry

» Unit:

Sweet Similar Shapes

Big Idea:Completing a hands-on activity, students will cut, categorize and discover properties of similar triangles.

Introduction to Similar Right Triangles

Geometry

» Unit:

Similar and Right Triangles

Big Idea:Students investigate the three similar right triangles created by the altitude to the hypotenuse of a right triangle.

Similar Triangles and the Flatiron Building

Geometry

» Unit:

Similarity in Triangles

Big Idea:The Flatiron Building located in New York City is one of the most iconic buildings in the country. Its unique triangular shape makes it a great subject for mathematical investigations.

More Discovering Similar Triangles

Geometry

» Unit:

Sweet Similar Shapes

Big Idea:Students will finish discovering key properties of similar triangles and will practice identifying if two shapes are similar.

Working with Similar Triangles, Part 2

Geometry

» Unit:

Similar Figures

Big Idea:Similar or not similar? That is the question!

Pulling It All Together (Part 1)

Geometry

» Unit:

Similar Figures

Big Idea:Students pull together concepts, both new and old, in preparation for a summative assessment.

Assessment for Sweet Similar Shapes

Geometry

» Unit:

Sweet Similar Shapes

Big Idea:Students will be assessed on their knowledge of similarity on a test or problem set.

Definition of Similarity and Similar Triangles

Geometry

» Unit:

Triangle Similarity and Trigonometric Ratios

Big Idea:Students' prior knowledge of transformations and congruence helps them make connections as they learn to use similarity shortcuts.

End of Year Assessment

Geometry

» Unit:

Final Assessment

Big Idea:This is a comprehensive assessment of all content learned to date.

Pulling It All Together (Part 2)

Geometry

» Unit:

Similar Figures

Big Idea:Students pull together concepts, both new and old, in preparation for a summative assessment.

Triangle Similarity Criteria

Geometry

» Unit:

Similarity

Big Idea:Enough is enough...but what is enough? In this lesson, students will determine the criteria that are sufficient for determining triangle similarity.

HSG-SRT.A.1

Verify experimentally the properties of dilations given by a center and a scale factor:

HSG-SRT.A.2

Given two figures, use the definition of similarity in terms of similarity transformations to decide if they are similar; explain using similarity transformations the meaning of similarity for triangles as the equality of all corresponding pairs of angles and the proportionality of all corresponding pairs of sides.

HSG-SRT.A.3

Use the properties of similarity transformations to establish the AA criterion for two triangles to be similar.