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Parts of a circle

Do you remember some key parts of a circle?

  • an arc is a section of the circumference of the circle
  • a sector is an area enclosed by two radii and an arc
  • a chord is a straight line connecting two points on the circumference of a circle
  • a segment is a section formed between an arc and a chord
A diagram showing key parts of circle, labelled chord, segment, sector and arc.