MA23-02 Maths Watch
Area of triangles, parallelograms and trapezia
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In this lesson
In this video you'll learn about area of triangles, parallelograms and trapezia for GCSE Maths, with worked examples and the mistakes examiners report. By the end you'll be able to apply the area formulae for triangles, parallelograms and trapezia, including questions where the perpendicular height is not given directly and must be found first.
What it covers
- 0:50 Start with a trapezium-shaped tile
- 1:44 A parallelogram-shaped tile: base 9 centimetres, perpendicular height 5 centimetres
- 2:30 The main event: a triangular flag
Key words
For: AQA GCSE 8300, Cambridge IGCSE 0580, Edexcel GCSE 1MA1, Edexcel IGCSE 4MA1, Eduqas GCSE C300, OCR GCSE J560
On the specification
| Board | Spec | Statement |
|---|---|---|
| AQA GCSE 8300 | G16 | Know and apply formulae to calculate: area of triangles, parallelograms, trapezia; |
| Cambridge IGCSE 0580 | C5.2 | Carry out calculations involving the perimeter and area of a rectangle, triangle, parallelogram and trapezium. |
| Cambridge IGCSE 0580 | E5.2 | Carry out calculations involving the perimeter and area of a rectangle, triangle, parallelogram and trapezium. |
| Edexcel GCSE 1MA1 | G16 | Know and apply formulae to calculate: area of triangles, parallelograms, trapezia; volume of cuboids and other right prisms (including cylinders) |
| Edexcel IGCSE 4MA1 | F4.9C | Find the area of simple shapes using the formulae for the areas of triangles and rectangles |
| Edexcel IGCSE 4MA1 | F4.9D | Find the area of parallelograms and trapezia |
| Eduqas GCSE C300 | FG14 | Know and apply formulae to calculate: area of squares, rectangles, triangles, parallelograms, trapezia; volume of cuboids and other right prisms (including cylinders) |
| Eduqas GCSE C300 | HG16 | Know and apply formulae to calculate: area of squares, rectangles, triangles, parallelograms, trapezia; volume of cuboids and other right prisms (including cylinders) |
| OCR GCSE J560 | 10.03a | Know and apply the formula: area = 1/2 base × height. |
| OCR GCSE J560 | 10.03b | Know and apply the formula: area = base × height. |
| OCR GCSE J560 | 10.03c | Calculate the area of a trapezium. |
For teachers
This GCSE Maths lesson teaches area of triangles, parallelograms and trapezia. By the end, students should be able to apply the area formulae for triangles, parallelograms and trapezia, including questions where the perpendicular height is not given directly and must be found first. It works through three worked examples and the mistakes examiners report.