HSG-CO.B.8

Explain how the criteria for triangle congruence (ASA, SAS, and SSS) follow from the definition of congruence in terms of rigid motions.

 
16 Lesson(s)
   

Discovering Triangle Congruence Shortcuts

Geometry » Unit: Discovering and Proving Triangle Properties
Geometry » Unit: Discovering and Proving Triangle Properties
Jessica Uy
Sunnyvale, CA
Environment: Suburban
 
Big Idea:

Through construction, students will work in pairs to test "shortcuts" to use when proving triangles congruent.

 
Favorites (14)
 
Resources (14)
 
Reflections (1)
warm up
   

Tremendous Triangles Projects

Geometry » Unit: Tremendous Triangles
Geometry » Unit: Tremendous Triangles
Stephanie Conklin
Saratoga Springs, NY
Environment: Suburban
 
Big Idea:

It's students' time to shine! Students develop their own problem and then shoot a video to explain how to prove their triangles congruent.

 
Favorites (9)
 
Resources (12)
 
Reflections (1)
video shoot image tremendous triangle project
   

Finally Finals #1

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

 
Favorites (5)
 
Resources (10)
final image
   

Angle-Side-Angle

Geometry » Unit: Proofs about Triangles
Geometry » Unit: Proofs about Triangles
Marisa Laks
New York, NY
Environment: Urban
 
Big Idea:

Students will write formal proofs showing how triangles are congruent when two corresponding angles and the included side are congruent.

 
Favorites (3)
 
Resources (18)
 
Reflections (1)
asa image
   

Overlapping Triangles

Geometry » Unit: Tremendous Triangles
Geometry » Unit: Tremendous Triangles
Stephanie Conklin
Saratoga Springs, NY
Environment: Suburban
 
Big Idea:

Students will color, highlight and mark-up diagrams to uncover congruent triangles and prove the triangles are congruent.

 
Favorites (3)
 
Resources (19)
 
Reflections (2)
proof image overlapping triangles
   

Fall Interim Assessment

Geometry » Unit: Fall Interim Assessment: Geometry Intro, Constructions and Rigid Motion
Geometry » Unit: Fall Interim Assessment: Geometry Intro, Constructions and Rigid Motion
Marisa Laks
New York, NY
Environment: Urban
 
Big Idea:

This is a comprehensive assessment of Units 1, 2 and 3.

 
Favorites (3)
 
Resources (6)
 
Reflections (1)
interim assessment image
   

Rigid Motion, Congruent Triangles, and Proof

Geometry » Unit: Polygons and Congruent Triangle Proofs
Geometry » Unit: Polygons and Congruent Triangle Proofs
Beth Menzie
Amsterdam, NY
Environment: Urban
 
Big Idea:

Using the method of flow chart proofs, students begin to develop the skills necessary to understand and create congruent triangle proofs.

 
Favorites (2)
 
Resources (14)
 
Reflections (1)
image flow chart
   

SSS, SAS, and ASA

Geometry » Unit: Rigid Motions
Geometry » Unit: Rigid Motions
Marisa Laks
New York, NY
Environment: Urban
 
Big Idea:

Students will create a graphic organizer to show the ways triangles are congruent.

 
Favorites (7)
 
Resources (22)
 
Reflections (1)
sss sas and asa
   

AAS and ASA Fun

Geometry » Unit: Tremendous Triangles
Geometry » Unit: Tremendous Triangles
Stephanie Conklin
Saratoga Springs, NY
Environment: Suburban
 
Big Idea:

Students will work with a partner to discover two more theorems as they explore why ASA and AAS congruence proves triangles are congruent.

 
Favorites (4)
 
Resources (22)
 
Reflections (2)
triangle construction aas and asa fun image
   

SAS-sy Triangles

Geometry » Unit: Tremendous Triangles
Geometry » Unit: Tremendous Triangles
Stephanie Conklin
Saratoga Springs, NY
Environment: Suburban
 
Big Idea:

In this student-centered lesson, students will explore and explain why the SAS congruence theorem works to prove triangles congruent.

 
Favorites (4)
 
Resources (35)
 
Reflections (5)
mark picture image sassy triangles
   

HL and More Practice with Proofs

Geometry » Unit: Tremendous Triangles
Geometry » Unit: Tremendous Triangles
Stephanie Conklin
Saratoga Springs, NY
Environment: Suburban
 
Big Idea:

SAS, AAS, SSS, ASA and now HL are all in the mix as students try to prove triangles congruent using any of these congruence theorems.

 
Favorites (3)
 
Resources (24)
 
Reflections (2)
twin triangles image hl and more practice with proofs
   

Side-Side-Side

Geometry » Unit: Proofs about Triangles
Geometry » Unit: Proofs about Triangles
Marisa Laks
New York, NY
Environment: Urban
 
Big Idea:

Students will write formal proofs showing how triangles are congruent when all three corresponding sides are congruent.

 
Favorites (2)
 
Resources (13)
sss image
   

Regular Polygons

Geometry » Unit: Polygons and Congruent Triangle Proofs
Geometry » Unit: Polygons and Congruent Triangle Proofs
Beth Menzie
Amsterdam, NY
Environment: Urban
 
Big Idea:

The students work together, applying their knowledge of polygons to numerical problems involving regular polygons.

 
Resources (17)
 
Reflections (1)
angle angle angle image
   

Common Core Geometry Midcourse Assessment Day 2 of 2

Geometry » Unit: Common Core Geometry Midcourse Assessment
Geometry » Unit: Common Core Geometry Midcourse Assessment
Marisa Laks
New York, NY
Environment: Urban
 
Big Idea:

This is the second day of a two day midcourse assessment. It covers content from the units on geometric proofs.

 
Resources (4)
midcourse assessment day 2 image
   

End of Year Assessment Review Day 1 of 4

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

In this lesson, students practice problems involving concepts from the units on constructions, transformations and rigid motions in order to review for the final assessment.

 
Favorites (1)
 
Resources (9)
assessment review image
Common Core Math
 
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