GCSE Maths (AQA)

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Circumference of a Circle & Pi

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Geometry and Measures Mensuration and Calculation

Circumference of a Circle & Pi

3:32 Circumference of a Circle
Spec N8 G17
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  • The circumference of a circle is the length of its single curved edge
  • The circumference of a circle is proportional to its diameter
  • The circumference is equal to pi times the diameter of the circle
  • Pi is a number that is equal to the ratio of the circumference of any circle to its diameter
  • Pi is approximately equal to 3.14
  • Pi is an irrational number with an infinite number of decimal places
  • In most exams, the value of pi can be obtained using a calculator
  • In non calculator papers, an approximate value of pi will be provided
  • The circumference of a circle can be calculated by multiplying the diameter by pi
  • Pi is just a number and does not have any units
  • The circumference should have the same units as the diameter, unless specified otherwise.

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