The Key Formulas
Part of Area of Rectangles & Triangles · GCSE GCSE Mathematics revision
This key facts covers The Key Formulas within Area of Rectangles & Triangles for GCSE Mathematics. Revise Area of Rectangles & Triangles in Geometry & Measures for GCSE Mathematics with 12 exam-style questions and 6 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 2 of 8 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 2 of 8
Practice
12 questions
Recall
6 flashcards
The Key Formulas
| Shape | Formula | Remember |
|---|---|---|
| Rectangle | Area = length × width | A = l × w |
| Square | Area = side × side | A = s² |
| Triangle | Area = ½ × base × height | A = ½bh |
Important: For triangles, the HEIGHT must be PERPENDICULAR (at 90°) to the base!
Keep building this topic
Read this section alongside the surrounding pages in Area of Rectangles & Triangles. That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for Area of Rectangles & Triangles
Which formula gives the area of a rectangle with length l and width w?
Explain why the area formula for a triangle uses the perpendicular height rather than the slant height.
Quick Recall Flashcards
12 questions on Area of Rectangles & Triangles — practise free
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