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.

# Unit 2: Module 2: Similarity, proof, and trigonometry

2,400 possible mastery points
Mastered
Proficient
Familiar
Attempted
Not started
Quiz
Unit test

"Just as rigid motions are used to define congruence in Module 1, so dilations are added to define similarity in Module 2. To be able to discuss similarity, students must first have a clear understanding of how dilations behave. This is done in two parts, by studying how dilations yield scale drawings and reasoning why the properties of dilations must be true. Once dilations are clearly established, similarity transformations are defined and length and angle relationships are examined, yielding triangle similarity criteria. An in-depth look at similarity within right triangles follows, and finally the module ends with a study of right triangle trigonometry." Eureka Math/EngageNY (c) 2015 GreatMinds.org

## Topic B: Dilations

### Practice

#### Quiz 1

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

## Topic C: Lessons 18-20: Similarity applications

### Practice

#### Quiz 2

Level up on the above skills and collect up to 640 Mastery points

## Topic D: Applying similarity to right triangles

### Practice

#### Quiz 3

Level up on the above skills and collect up to 240 Mastery points

## Topic E: Lesson 34: Unknown angles

### Practice

#### Quiz 4

Level up on the above skills and collect up to 320 Mastery points

## Topic E: Lessons 32-33: Laws of sines and cosines

### Practice

#### Quiz 5

Level up on the above skills and collect up to 320 Mastery points
Up next for you:

#### Unit test

Level up on all the skills in this unit and collect up to 2,400 Mastery points!