Circles

Geometry · O/L Maths

Circle theorems on chords, angles and tangents.

sub-topics

• Parts of a circle
  Radius, chord, arc, sector and segment.
• Chord theorems
  Perpendicular from the centre and equal chords.
• Angle theorems
  Angle at the centre, angles in the same segment, semicircle.
• Cyclic quadrilaterals
  Opposite angles and exterior angle property.
• Tangents
  Tangent–radius property and alternate segment theorem.