12 Components
Big Ideas
Formative Assessment Lesson
End of Unit Assessments
Browse Components
Big Ideas
Formative Assessment Lesson
End of Unit Assessments
Big Idea:

### SSS, SAS, and ASA are sufficient criteria to justify triangle congruence.

1 week

Evidence of Understanding

• justify the minimum requirements that show two triangles are congruent
• describe how a sequence of transformations demonstrates the mapping of corresponding sides for two congruent figures
• use notations to signify the corresponding parts
• make conjectures about the minimum corresponding parts of the triangle needed to construct a congruent triangle
• experiment with constructions to support these claims
• give examples, non examples, or counterexamples about these claims
• use transformations of these parts to support their claim that the triangles are congruent
• justify that when all corresponding sides of two triangles are congruent (SSS) there is sufficient evidence to show that these two triangles are congruent
• use tools to construct a copy of a given triangle using side measurements
• justify that when two corresponding sides and the included angle are congruent (SAS) there is sufficient evidence to show that these two triangles are congruent
• use tools to construct a copy of a given triangle using two side measurements and the included angle
• establish the the minimum criteria necessary to prove two right triangles are congruent using the hypotenuse and a leg (HL)
• justify that when two corresponding angles and the included side of two triangles are congruent (ASA) there is sufficient evidence to show that these two triangles are congruent
• use tools to construct a copy of a given triangle using two angle measurements and the included side
• justify why the angle has to be the included angle of the corresponding sides using constructions (SSA does not work)

Develop conceptual understanding:

SSS, SAS, HL, ASA

Supporting terms to communicate:

included angle/side, construct, copy, corresponding parts, preserve, congruent, sequence of transformations, rotate, reflect, translate, parallel, perpendicular
Core Resource
A core resource supports multiple days of instruction. COMING SOON!
Instructional Routine: Contemplate then Calculate
These tasks are embedded within the instructional routine called Contemplate then Calculate. COMING SOON!