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Khan Academy (English - US curriculum)
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Khan Academy (English - US curriculum)
Math by grade
Illustrative Mathematics
8th grade (Illustrative Mathematics)
Unit 1: Rigid transformations and congruence
Lesson 7: No bending or stretching
Lesson 7: No bending or stretching
Rigid transformations intro
Finding measures using rigid transformations
Rigid transformations: preserved properties
Find measures using rigid transformations