HSG-SRT.A.1

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

 
20 Lesson(s)
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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
   

Introduction to Similar Figures

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

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

 
Favorites (26)
 
Resources (10)
working with similar
   

Dilation Nation

Geometry » Unit: Transformers and Transformations
Geometry » Unit: Transformers and Transformations
Stephanie Conklin
Saratoga Springs, NY
Environment: Suburban
 
Big Idea:

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

 
Favorites (3)
 
Resources (15)
tigers dilating
   

Perspective Art Project

8th Grade Math » Unit: Linear Equations in two Variables
8th Grade Math » Unit: Linear Equations in two Variables
Christa  Lemily
Bowling Green, KY
Environment: Suburban
 
Big Idea:

This project is fun, fun, fun for students and also so educational on a middle school and high school level connecting dilations, similar figures, and 3-D art!

 
Favorites (6)
 
Resources (26)
 
Reflections (3)
perspective art project lesson image
   

Scale Factor

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

Students use examples from the book Alice’s Adventures in Wonderland to explore the concept of scale factor.

 
Favorites (5)
 
Resources (14)
scale factor image resized li
   

Dilations on the Coordinate Plane, Center (0, 0)

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

Students dilate objects on the coordinate plane and identify the scale factor of dilations that take a pre-image to an image.

 
Favorites (1)
 
Resources (16)
dilations center 0 0 image
   

Satellite Overflight 1

Geometry » Unit: Scaling Up- Dilations, Similarity and Proportional Relationships
Geometry » Unit: Scaling Up- Dilations, Similarity and Proportional Relationships
Tom Chandler
Ault, CO
Environment: Rural
 
Big Idea:

Students learn how dilating a shape affects perimeter and area as they design a sign large enough to show up on Google Earth.

 
Favorites (2)
 
Resources (16)
satelliteoverflight image
   

Dilations on the Coordinate Plane, Center (h, k)

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

Students will practice performing and describing dilations with centers other than (0, 0) and scale factors greater than one or between zero and one.

 
Favorites (2)
 
Resources (19)
dilations from hk image resized
   

Dilations using Geometer's Sketchpad

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

Students using Geometer's Sketchpad to investigate dilations about a variety of centers.

 
Resources (13)
dilations using geometer s sketchpad
   

Properties of Dilations Extension Lesson

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

Students will investigate how to perform a dilation about a center (h, k) without graphing the object.

 
Resources (14)
properties of dilations extension activity image resized
   

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
   

Finally Finals #2

Geometry » Unit: Finally Finals
Geometry » Unit: Finally Finals
Stephanie Conklin
Saratoga Springs, NY
Environment: Suburban
 
Big Idea:

Students will lead review of the Geometry curriculum by creating review sheets for specific topics like circles or parallelograms and present these to their peers.

 
Favorites (2)
 
Resources (10)
finals image 3
   

Experimenting with Dilations

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

Time for pupils to dilate...and we're not talking optometry. In this lesson, students get familiar with the major characteristics of dilations.

 
Favorites (2)
 
Resources (14)
 
Reflections (1)
dilated pupil
   

Satellite Overflight 2

Geometry » Unit: Scaling Up- Dilations, Similarity and Proportional Relationships
Geometry » Unit: Scaling Up- Dilations, Similarity and Proportional Relationships
Tom Chandler
Ault, CO
Environment: Rural
 
Big Idea:

Students learn how dilating a shape affects perimeter and area as they design a sign large enough to show up on Google Earth.

 
Favorites (3)
 
Resources (11)
satelliteoverflight image2

A dilation takes a line not passing through the center of the dilation to a parallel line, and leaves a line passing through the center unchanged.

The dilation of a line segment is longer or shorter in the ratio given by the scale factor.

Common Core Math
 
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