Circle chords. How to prove the relationship between two chords intersecting OUTSIDE a circle.

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This problem is representative of a level 9 GCSE question.

The proof shown in the video gives the format that is required in UK examinations at GCSE level to earn the full marks; three mathematical facts clearly stated with reasons and the concept of similar triangles used to complete the proof.

Note that a second video ‘CIRCLE CHORDS 1’ proves the relationship when the chords intersect INSIDE the circle.
  1. The Maths Tutor
  2. Intersecting chords in a circle
  3. Chords in a circle
  4. Circle
  5. circle chords
  6. level 9 gcse
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