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

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## 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### Learn

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- 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!

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

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- Finding angle measures using trianglesGet 5 of 7 questions to level up!

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

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- 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!

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- 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!

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- 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!

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- Line and angle proofsGet 3 of 4 questions to level up!
- Mapping shapesGet 3 of 4 questions to level up!
- Corresponding sides and pointsGet 3 of 4 questions to level up!
- Corresponding parts of congruent trianglesGet 3 of 4 questions to level up!

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- Determine congruent trianglesGet 5 of 7 questions to level up!
- Find angles in isosceles trianglesGet 3 of 4 questions to level up!
- Find angles in congruent trianglesGet 3 of 4 questions to level up!

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Level up on all the skills in this unit and collect up to 2600 Mastery points!