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FM Circumference

2.1 Circles and Arcs


  • The set of all points in the plane that are a fixed distance (the radius, r) from a fixed point (the centre, O).
  • The angle at the centre of a circle is 360°.

Diameter (D)

  • A chord passing through the centre.
  • D = 2r, twice the length of the radius.

Circumference of a Circle

  • The circumference of a circle, AKA the perimeter, is given by:

c=2 \pi r

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