HSG-CO.B.7

Use the definition of congruence in terms of rigid motions to show that two triangles are congruent if and only if corresponding pairs of sides and corresponding pairs of angles are congruent.

 
12 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
   

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
   

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 Motions and Congruence

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

Students will build on prior knowledge to develop a definition of congruence in terms of rigid motion.

 
Favorites (9)
 
Resources (20)
 
Reflections (1)
rigid motions and congruence 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
   

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
   

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
   

End of Year Assessment

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

Analyzing the Symmetry of a Polygon

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

Students use the symmetry of a polygon to deduce its properties while continuing to develop their ability to use transformations. Now, just where does that line of symmetry have to be?

 
Favorites (2)
 
Resources (27)
 
Reflections (1)
analyzingthesymmetryofapolygon 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
   

Quadrilaterals Transfer Task

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

Mathematicians Wanted....Apply Here. In this lesson students apply what they have learned in the Quadrilaterals Unit to novel problems.

 
Resources (5)
kite
Common Core Math
 
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