This deep dive covers Method: Finding Area within Circumference & Area of Circles for GCSE Mathematics. Revise Circumference & Area of Circles in Geometry & Measures for GCSE Mathematics with 11 exam-style questions and 7 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 5 of 10 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Method: Finding Area
- Find the radius (if given diameter, halve it!)
- Square the radius (r × r)
- Multiply by π
- Include units² (cm², m², etc.)
Practice questions for Circumference & Area of Circles
A circle has radius r. Which pair of formulas gives the correct circumference C and area A?
Explain why the circumference of a circle is measured in cm (or other length units) but the area is measured in cm² (square units).
Quick recall flashcards
Circumference
C = πd or C = 2πr
Area of Circle
A = πr²