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Sector Graphs or Pie Charts

A sector graph is also called a pie chart, and has the following characteristics:

  • a circle is divided into sectors
  • the angle at the centre of each sector is in proportion to the value of the data it represents
  • the value of the data is each sector is found by measuring the angle of the sector at the centre, divided by the 360° and then multiplying the total number of the data in the sector
  • in other words, value of the sector =  ({angle of the sector}/{360^circ})~*~{total value of the data}
  • no axes are needed for this graph


Sector graphs work best when you have to represent information or data that is expressed as a fraction or percentage of a whole.