Area & Circumference of Circle
Maths: Edexcel IGCSE Higher, topic 4.7.4
Circle Formulae
There are standard formulae for the area and circumference of a circle.
Area
- The area of a circle is given by A = πr2.
- π is the circle constant called ‘pi’ and is roughly 3.142.
Circumference
- The circumference of a circle is its perimeter:
- Circumference = 2πr = πd
- Where d is the diameter or r is the radius.
Test yourself on Area & Circumference of Circle
What is π to 2 decimal places?
What is the symbol for 'pi'?