HSG-SRT.A.2

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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.

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## 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.

16 Lesson(s)

### Transformations + Similarity

Geometry »
Unit: Sweet Similar Shapes

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.

Standards:

Favorites
(7)

Resources
(16)

Reflections
(1)

Big Idea:

#### It's time for Jeopardy! In this review lesson, students will play Jeopardy to review key topics covered in the Geometry curriculum like transformations and perpendicular bisectors.

Standards:

Favorites
(6)

Resources
(10)

Big Idea:

#### What are dilations good for? Let's look at similar figures!

Standards:

Favorites
(26)

Resources
(10)

### Discovering Similar Triangles

Geometry »
Unit: Sweet Similar Shapes

Geometry »
Unit: Sweet Similar Shapes

Big Idea:

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

Standards:

Favorites
(21)

Resources
(29)

Reflections
(5)

### Dilation Nation

Geometry »
Unit: Transformers and Transformations

Geometry »
Unit: Transformers and Transformations

Big Idea:

#### Students will review transformations using a brain pop and learn how to geometrically enlarge and shrink shapes.

Standards:

Favorites
(3)

Resources
(15)

### Similar Triangle Practice

Geometry »
Unit: Similarity in Triangles

Geometry »
Unit: Similarity in Triangles

Big Idea:

#### In this lesson, students apply the properties and theorems studied throughout the unit to justify that triangles are similar.

Standards:

Favorites
(2)

Resources
(17)

### More Discovering Similar Triangles

Geometry »
Unit: Sweet Similar Shapes

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.

Standards:

Favorites
(2)

Resources
(14)

### Review Day for Sweet Similar Shapes

Geometry »
Unit: Sweet Similar Shapes

Geometry »
Unit: Sweet Similar Shapes

Big Idea:

#### Students will use the SMART Clickers to review key topics for this unit like, identifying similar shapes, and then complete a practice test.

Standards:

Resources
(14)

### Assessment for Sweet Similar Shapes

Geometry »
Unit: 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.

Standards:

Favorites
(1)

Resources
(12)

Reflections
(1)

Big Idea:

#### This is a comprehensive assessment of all content learned to date.

Standards:

Favorites
(1)

Resources
(12)

Reflections
(1)

### Definition of Similarity and Similar Triangles

Geometry »
Unit: Triangle Similarity and Trigonometric Ratios

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.

Standards:

Favorites
(1)

Resources
(28)

Reflections
(3)

### Radian measure Day 2 of 2

12th Grade Math »
Unit: Trigonometry as a Real-Valued Functions

12th Grade Math »
Unit: Trigonometry as a Real-Valued Functions

Big Idea:

#### Through sharing of problem solving strategies students will develop a description for measuring angles in radians and use the relationship with degrees to find special angles.

Standards:

Favorites
(1)

Resources
(17)

Big Idea:

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

Standards:

Favorites
(2)

Resources
(15)

Reflections
(1)

### End of Year Assessment Review Day 3 of 4

Geometry »
Unit: Final Assessment

Geometry »
Unit: Final Assessment

Big Idea:

#### In this lesson, students practice problems involving concepts from the units on similarity, trigonometry and coordinate geometry.

Resources
(11)

Reflections
(1)

### Similarity Group Assessment

Geometry »
Unit: Triangle Similarity and Trigonometric Ratios

Geometry »
Unit: Triangle Similarity and Trigonometric Ratios

Big Idea:

#### Students will be able to apply their understanding of triangle similarity in novel ways to write proofs and demonstrate their understanding on a group assessment.

Standards:

Resources
(12)

Reflections
(1)

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HS Algebra

HS Functions

HS Geometry

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First Grade

Second Grade

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Fifth Grade

Sixth Grade

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Ninth and Tenth Grade

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