HSG-CO.D.12

Make formal geometric constructions with a variety of tools and methods (compass and straightedge, string, reflective devices, paper folding, dynamic geometric software, etc.). Copying a segment; copying an angle; bisecting a segment; bisecting an angle; constructing perpendicular lines, including the perpendicular bisector of a line segment; and constructing a line parallel to a given line through a point not on the line.

 
58 Lesson(s)
   

Line It Up!

Geometry » Unit: Line-sanity!
Geometry » Unit: Line-sanity!
Stephanie Conklin
Saratoga Springs, NY
Environment: Suburban
 
Big Idea:

In this student-centered lesson, students work together to construct parallel and perpendicular lines while also writing equations for these lines.

 
Favorites (6)
 
Resources (39)
 
Reflections (5)
art and lines line it up image
   

Models & Constructions Unit Quiz

Geometry » Unit: Models and Constructions
Geometry » Unit: Models and Constructions
Tom Chandler
Ault, CO
Environment: Rural
 
Big Idea:

Students show what they have learned: from vocabulary and basic skills to an application in an unfamiliar context.

 
Favorites (3)
 
Resources (31)
 
Reflections (4)
quotation poincare
   

Intersection Logic

Geometry » Unit: Dimension and Structure
Geometry » Unit: Dimension and Structure
Tom Chandler
Ault, CO
Environment: Rural
 
Big Idea:

Using conjectures about intersections to justify a claim: students find the right argument to make their case.

 
Favorites (1)
 
Resources (28)
 
Reflections (2)
intersectionlogic image
   

Tools of Geometry Unit Assessment

Geometry » Unit: Tools of Geometry
Geometry » Unit: Tools of Geometry
Beth Menzie
Amsterdam, NY
Environment: Urban
 
Big Idea:

Test time! Students take the first unit assessment, aligned to the Common Core standards for this unit.

 
Favorites (8)
 
Resources (13)
image2 test
   

Algebra and Angle Pairs

Geometry » Unit: Tools of Geometry
Geometry » Unit: Tools of Geometry
Beth Menzie
Amsterdam, NY
Environment: Urban
 
Big Idea:

More basics of Geometry: Drawing diagrams, identifying and naming angles and angle pairs, and solving algebraic problems involving angle pairs. And an answer to that eternal question - why can't we just measure instead of doing constructions?

 
Favorites (8)
 
Resources (16)
 
Reflections (1)
image basics of coord geom
   

Going Halvesies

Geometry » Unit: Models and Constructions
Geometry » Unit: Models and Constructions
Tom Chandler
Ault, CO
Environment: Rural
 
Big Idea:

What are the properties of a bisector? Students see for themselves--and find that a compass is an efficient instrument for comparing distances.

 
Favorites (3)
 
Resources (27)
goinghalvesies image
   

Angle Management

Geometry » Unit: Dimension and Structure
Geometry » Unit: Dimension and Structure
Tom Chandler
Ault, CO
Environment: Rural
 
Big Idea:

Using constructions to understand the structure of an angle and to model the operation of a navigator's position-finder.

 
Favorites (1)
 
Resources (40)
 
Reflections (3)
anglemanagement image
   

From Perpendiculars to Parallels

Geometry » Unit: Congruence and Rigid Motions
Geometry » Unit: Congruence and Rigid Motions
Tom Chandler
Ault, CO
Environment: Rural
 
Big Idea:

Students consolidate and extend their knowledge of constructions related to bisectors: "A perpendicular to a perpendicular is a parallel."

 
Favorites (3)
 
Resources (29)
 
Reflections (2)
fromperpendicularstoparallels image
   

Bisector Bonanza

Geometry » Unit: Congruence and Rigid Motions
Geometry » Unit: Congruence and Rigid Motions
Tom Chandler
Ault, CO
Environment: Rural
 
Big Idea:

Students use compass and straight-edge, aided by tracing paper and paper-folding, to explore the properties of bisectors, while gaining insights into the workings of transformations.

 
Favorites (3)
 
Resources (26)
 
Reflections (2)
bisectorbonza image
   

Reviewing Intersections

Geometry » Unit: Dimension and Structure
Geometry » Unit: Dimension and Structure
Tom Chandler
Ault, CO
Environment: Rural
 
Big Idea:

Students review homework and complete their learning portfolios for the unit. How much have we learned?

 
Favorites (1)
 
Resources (26)
 
Reflections (2)
reviewingconstructions image
   

Reviewing Structure

Geometry » Unit: Dimension and Structure
Geometry » Unit: Dimension and Structure
Tom Chandler
Ault, CO
Environment: Rural
 
Big Idea:

Students review homework and assess their progress. How much have we learned?

 
Favorites (1)
 
Resources (25)
 
Reflections (1)
reviewingconstructions image
   

Introduction to Geometry (Part 2)

Geometry » Unit: Tools of Geometry
Geometry » Unit: Tools of Geometry
Beth Menzie
Amsterdam, NY
Environment: Urban
 
Big Idea:

It's all about angles! Angles, angle pairs, and how to bisect them.

 
Favorites (12)
 
Resources (19)
 
Reflections (1)
image intro to geometry2
   

Reviewing Constructions

Geometry » Unit: Models and Constructions
Geometry » Unit: Models and Constructions
Tom Chandler
Ault, CO
Environment: Rural
 
Big Idea:

Students review homework and complete their learning portfolios for the unit. How much have we learned?

 
Favorites (2)
 
Resources (21)
reviewingconstructions image
   

Pulling It All Together: Tools of Geometry Unit Review

Geometry » Unit: Tools of Geometry
Geometry » Unit: Tools of Geometry
Beth Menzie
Amsterdam, NY
Environment: Urban
 
Big Idea:

Time to pull it all together! Students work cooperatively, applying the concepts of this unit in preparation for the unit test.

 
Favorites (3)
 
Resources (17)
image 2 unit review
   

Composition of Transformations

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

Students are challenged to create their own series of successive transformations. In this process, they teach themselves about composition and enhance their understanding of transformations.

 
Favorites (13)
 
Resources (19)
 
Reflections (1)
u4l3 image resized
Common Core Math
 
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