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- HSG-CO.D.12Make 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.
- HSG-CO.D.13Construct an equilateral triangle, a square, and a regular hexagon inscribed in a circle.

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.

Line It Up!

Geometry

» Unit:

Line-sanity!

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

Models & Constructions Unit Quiz

Geometry

» Unit:

Models and Constructions

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

Intersection Logic

Geometry

» Unit:

Dimension and Structure

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

Tools of Geometry Unit Assessment

Geometry

» Unit:

Tools of Geometry

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

Algebra and Angle Pairs

Geometry

» Unit:

Tools of Geometry

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?

Going Halvesies

Geometry

» Unit:

Models and Constructions

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.

Angle Management

Geometry

» Unit:

Dimension and Structure

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

From Perpendiculars to Parallels

Geometry

» Unit:

Congruence and Rigid Motions

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

Bisector Bonanza

Geometry

» Unit:

Congruence and Rigid Motions

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.

Reviewing Intersections

Geometry

» Unit:

Dimension and Structure

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

Reviewing Structure

Geometry

» Unit:

Dimension and Structure

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

Introduction to Geometry (Part 2)

Geometry

» Unit:

Tools of Geometry

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

Reviewing Constructions

Geometry

» Unit:

Models and Constructions

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

Pulling It All Together: Tools of Geometry Unit Review

Geometry

» Unit:

Tools of Geometry

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

Composition of Transformations

Geometry

» Unit:

Transformations

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.

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.

HSG-CO.D.13

Construct an equilateral triangle, a square, and a regular hexagon inscribed in a circle.