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← 2.4 Circles, Chords and Tangents

A tangent and a secant

Mathematics · Grade 11 · about 40 minutes

If a tangent and a secant start at the same outside point, the square of the tangent equals the product of the whole secant and its external part.

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Other lessons in this sub-strand

  1. The line from the centre to a chord
  2. Two chords that cross
  3. A tangent meets the radius
  4. The two tangents from one point
  5. Drawing the tangents
  6. A tangent and a secant
  7. Two secants from one point
  8. The alternate segment
  9. A direct common tangent
  10. A transverse common tangent
  11. When two circles touch
  12. The circle through three vertices
  13. The incircle and an excircle
  14. Centroid and orthocentre