The 7 Circle Theorems

  • Created by: mm2004
  • Created on: 10-09-18 18:23

Circle Theorem 1

The angle at the centre is double the angle at the circumference 

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Circle Theorem 2

Angles in the same segment are equal

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Circle Theorem 3

Opposite angles in a cyclical quadrilateral add up to 180 degrees

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Circle Theorem 4

The angle at the circumerence in a semi circle is a right angle 

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Circle Theorem 5

The angle between a tangent and a radius is 90 degrees

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Circle Theorem 6

The perpendicular from the centre of the circle to a chord bisects the chord.

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Circle Theorem 7

The angle between a tangent and a chord is equal to the angle in the alternate segment 

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