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← 4.2 Differentiation (I)

Equation of a normal

Mathematics · Grade 11 · about 40 minutes

Find the line through the point of contact perpendicular to the tangent, using gradient -1/m, or a vertical line when the tangent is horizontal.

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Other lessons in this sub-strand

  1. Gradient of a straight line
  2. Average rate of change
  3. The tangent and an instantaneous rate
  4. The derivative from first principles
  5. The power rule for polynomials
  6. The gradient at a chosen point
  7. Equation of a tangent
  8. Equation of a normal
  9. Velocity from displacement
  10. Acceleration, and finding a time