HSG-SRT.A.3

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

 
16 Lesson(s)
   

Transformations + Similarity

Geometry » Unit: Sweet Similar Shapes
Geometry » Unit: Sweet Similar Shapes
Stephanie Conklin
Saratoga Springs, NY
Environment: Suburban
 
Big Idea:

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

 
Favorites (6)
 
Resources (16)
 
Reflections (1)
quilt transformations and similarity
   

2 Triangles in 1

Geometry » Unit: Sweet Similar Shapes
Geometry » Unit: Sweet Similar Shapes
Stephanie Conklin
Saratoga Springs, NY
Environment: Suburban
 
Big Idea:

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

 
Favorites (3)
 
Resources (19)
 
Reflections (2)
avatar 2 triangles in 1 image
   

Error Analysis: Finding Sides of Similar Triangles

Geometry » Unit: Similar Figures
Geometry » Unit: Similar Figures
Beth Menzie
Amsterdam, NY
Environment: Urban
 
Big Idea:

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

 
Favorites (9)
 
Resources (10)
image error analysis
   

Proving that Triangles are Similar

Geometry » Unit: Similar Figures
Geometry » Unit: Similar Figures
Beth Menzie
Amsterdam, NY
Environment: Urban
 
Big Idea:

Similar triangle proofs, made easy and understandable!

 
Favorites (9)
 
Resources (9)
similar triangles image
   

Discovering Similar Triangles

Geometry » Unit: Sweet Similar Shapes
Geometry » Unit: Sweet Similar Shapes
Stephanie Conklin
Saratoga Springs, NY
Environment: Suburban
 
Big Idea:

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

 
Favorites (18)
 
Resources (29)
 
Reflections (5)
isos triangles with colors
   

Introduction to Similar Right Triangles

Geometry » Unit: Similar and Right Triangles
Geometry » Unit: Similar and Right Triangles
Beth Menzie
Amsterdam, NY
Environment: Urban
 
Big Idea:

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

 
Favorites (7)
 
Resources (19)
 
Reflections (1)
image sim right triangles intro
   

Similar Triangles and the Flatiron Building

Geometry » Unit: Similarity in Triangles
Geometry » Unit: Similarity in Triangles
Marisa Laks
New York, NY
Environment: Urban
 
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.

 
Favorites (3)
 
Resources (17)
 
Reflections (1)
similar triangles and the flatiron building image
   

More Discovering Similar Triangles

Geometry » Unit: Sweet Similar Shapes
Geometry » Unit: Sweet Similar Shapes
Stephanie Conklin
Saratoga Springs, NY
Environment: Suburban
 
Big Idea:

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

 
Favorites (2)
 
Resources (14)
more discovering triangles image
   

Working with Similar Triangles, Part 2

Geometry » Unit: Similar Figures
Geometry » Unit: Similar Figures
Beth Menzie
Amsterdam, NY
Environment: Urban
 
Big Idea:

Similar or not similar? That is the question!

 
Favorites (2)
 
Resources (10)
image working with sim triangles 2 resized
   

Pulling It All Together (Part 1)

Geometry » Unit: Similar Figures
Geometry » Unit: Similar Figures
Beth Menzie
Amsterdam, NY
Environment: Urban
 
Big Idea:

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

 
Favorites (1)
 
Resources (11)
similar triangles image 4
   

Assessment for Sweet Similar Shapes

Geometry » Unit: Sweet Similar Shapes
Geometry » Unit: Sweet Similar Shapes
Stephanie Conklin
Saratoga Springs, NY
Environment: Suburban
 
Big Idea:

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

 
Favorites (1)
 
Resources (12)
 
Reflections (1)
assessment sweet similar shapes image
   

End of Year Assessment

Geometry » Unit: Final Assessment
Geometry » Unit: Final Assessment
Marisa Laks
New York, NY
Environment: Urban
   

Definition of Similarity and Similar Triangles

Geometry » Unit: Triangle Similarity and Trigonometric Ratios
Geometry » Unit: Triangle Similarity and Trigonometric Ratios
Jessica Uy
Sunnyvale, CA
Environment: Suburban
 
Big Idea:

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

 
Favorites (1)
 
Resources (28)
 
Reflections (3)
similar figures picture li
   

Pulling It All Together (Part 2)

Geometry » Unit: Similar Figures
Geometry » Unit: Similar Figures
Beth Menzie
Amsterdam, NY
Environment: Urban
 
Big Idea:

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

 
Resources (9)
similar triangles image 5
   

Triangle Similarity Criteria

Geometry » Unit: Similarity
Geometry » Unit: Similarity
Anthony Carruthers
Pasadena, CA
Environment: Suburban
 
Big Idea:

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

 
Favorites (2)
 
Resources (15)
 
Reflections (1)
similar triangles
Common Core Math
 
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