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Khan Academy (English - US curriculum)
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Khan Academy (English - US curriculum)
Math by grade
Illustrative Mathematics
6th grade (Illustrative Mathematics)
Unit 1: Area and surface area
Unit 1: Area and surface area
Lesson 3: Reasoning to find area
Lesson 6: Area of parallelograms
Lesson 9: Formula for area of a triangle
Lesson 11: Polygons
Lesson 12: What is surface area?
Lesson 13: Polyhedra
Lesson 14: Nets and surface area
Lesson 15: More nets, more surface area
Extra practice: Surface area
Lesson 18: Surface area of a cube