Mathematics Class 8
Area
Find the area of any leaning shape, and spot the real height.
11 lessons · ~75 min total
Track progress — 0 of 11 lessons read 0%
Lessons in this topic
- 0 Start here A roadmap: part squares, cut and slide, the height, a trapezium, awkward outlines and square units. · 4 min You are here
- 1 When a square is only half covered A part square still counts, as the part it really holds. · 6 min
- 2 A rectangle without counting Multiplying the two sides is the row count done fast. · 6 min
- 3 Cut a piece off and slide it across A parallelogram cut and slid becomes a rectangle: base × the gap. · 7 min
- 4 Two of the same triangle, fitted together A triangle and its half-turned copy make one parallelogram: the triangle is half. · 7 min
- 5 The length that is the height The height is the distance square across from the base, not the slanted side. · 8 min
- 6 Two parallel sides, averaged Average the two parallel sides, then multiply by the gap between them. · 8 min
- 7 Awkward outlines, ordinary pieces Split it into shapes that have a rule, then add or take away. · 8 min
- 8 A square metre is bigger than it sounds Use the 100 twice: 100 cm along and 100 cm up give 10,000 cm². · 7 min
- 9 The big picture Eight ideas, tied back together. · 5 min
- 10 Track quiz A cheat-sheet table and eight questions, one per idea. · 9 min
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