Circle Properties


a circle is a plane shape formed by a curve such that all points on the curve are the same distance from a fixed point, called the centre.

Key Skills

  • know the names of all of the parts of circles.
  • know the properties of radii and tangents to circles.


circle, circumference, radius(radii), diameter, arc, major arc, minor arc, chord, segment, sector, tangent, concyclic, concentric