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Level 2 Certificate Mathematics · key term
A straight line through a point on a curve that is perpendicular to the tangent at that point.
Used by AQA
Specification 4.4 · Paper 1, Paper 2
Revise: Equations of Tangents and NormalsThe normal passes through the same point but is perpendicular to the tangent: the two lines meet at a right angle.
For a normal, take the negative reciprocal of the tangent gradient, not just its negative.
Check that your line passes through the given point. For a non-horizontal tangent, the tangent and normal gradients should multiply to −1.
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