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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
Unit 1: Rigid transformations and congruence
Lesson 3: Grid moves
Lesson 5: Coordinate moves
Lesson 6: Describing transformations
Lesson 7: No bending or stretching
Extra practice: Transformations
Lesson 12: Congruent polygons
Lesson 14: Alternate interior angles
Lesson 15: Adding the angles in a triangle
Lesson 16: Parallel lines and the angles in a triangle