If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

# Unit: Module 1: Congruence, proof, and constructions

#### 0

Possible mastery points

## Topic B: Lesson 6: Solve for unknown angles—angles and lines at a point

Practice
Equation practice with vertical anglesGet 3 of 4 questions to level up!
Complementary and supplementary angles (visual)Get 3 of 4 questions to level up!
Equation practice with angle additionGet 3 of 4 questions to level up!
Finding angle measures between intersecting linesGet 3 of 4 questions to level up!

## Topic B: Lesson 7: Solve for unknown angles—transversals

Practice
Angle relationships with parallel linesGet 5 of 7 questions to level up!
Equation practice with anglesGet 3 of 4 questions to level up!

## Topic B: Lessons 9-11: Unknown angle proofs

#### Quiz 1

Level up on the above skills and collect up to 700 Mastery points

## Topic C: Lesson 12: Transformations—The next level

Practice
Identify transformations Get 3 of 4 questions to level up!

## Topic C: Lesson 13: Rotations

Practice
Rotate pointsGet 3 of 4 questions to level up!
Determine rotationsGet 3 of 4 questions to level up!
Rotate shapesGet 3 of 4 questions to level up!

#### Quiz 2

Level up on the above skills and collect up to 400 Mastery points

## Topic C: Lesson 14: Reflections

Practice
Reflect pointsGet 3 of 4 questions to level up!
Determine reflectionsGet 3 of 4 questions to level up!
Determine reflections (advanced)Get 3 of 4 questions to level up!
Reflect shapesGet 3 of 4 questions to level up!

## Topic C: Lesson 15: Rotations, reflections, and symmetry

#### Quiz 3

Level up on the above skills and collect up to 500 Mastery points

## Topic C: Lesson 16: Translations

Practice
Translate pointsGet 3 of 4 questions to level up!
Determine translationsGet 3 of 4 questions to level up!
Translate shapesGet 3 of 4 questions to level up!

## Topic C: Lessons 17-21: Applications of transformations

Practice
Line and angle proofsGet 3 of 4 questions to level up!
Mapping shapesGet 3 of 4 questions to level up!

#### Quiz 4

Level up on the above skills and collect up to 500 Mastery points

## Topic D: Lessons 26-27: Triangle congruency proofs

#### Quiz 5

Level up on the above skills and collect up to 300 Mastery points

## Topic G: Axiomatic systems

Up next for you:

#### Unit test

Level up on all the skills in this unit and collect up to 2400 Mastery points!

### About this unit

"Module 1 embodies critical changes in Geometry as outlined by the Common Core. The heart of the module is the study of transformations and the role transformations play in defining congruence. The topic of transformations is introduced in a primarily experiential manner in Grade 8 and is formalized in Grade 10 with the use of precise language. The need for clear use of language is emphasized through vocabulary, the process of writing steps to perform constructions, and ultimately as part of the proof-writing process." Eureka Math/EngageNY (c) 2015 GreatMinds.org