Circle Theorems

• A tangent and a radius meet at…?

  90°
• Two radii form…?

  An isosceles triangle.
• The perpendicular bisector of a chord passes through…?

  The centre of the circle.
• The angle at the centre is…?

  Twice the angle at the circumference.
• A triangle drawn from the two ends of a diameter…?


  Makes an angle of 90°.
• Angles in the same segment are…?

  Equal.
• The two angles on opposite sides of a chord add up to…?

  180°.
• Opposite angles in a cyclic quadrilateral add up to…?

  180°.
• Tangents from the same point are…?

  The same length.
• The angle between a tangent and a chord is always equal to…?

  The angle in the alternate segment.