Circle Theorms

Here are some Circle theorms that will be useful for the maths exams.

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  • Created by: kira
  • Created on: 02-06-11 18:03

  • The angle between the tangent and a radius is 90 degrees.
  • The lengths of the two tangents from a point to a circle are equal.
  • The perpendicular from the centre of a circle to chord bisects the chord.
  • The angle subtended at the centre of a circle is twice the angle at the circumference.
  • The ange in a semi-circle is a right angle.
  • Angles in the same tangent are equal.
  • Opposite angles of  cyclic quadrilateral are supplementary.
  • The angle between a tangent and a chord is equal to the angle in the alternate segment.
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