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    How do we know that the curve's gradient is perpendicular to the line m at Point B?
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    Actually just didn't read the question properly! I get it now XD
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    (Original post by kiwifruit99)
    How do we know that the curve's gradient is perpendicular to the line m at Point B?
    The gradient of the normal to the curve at a point P is perpendicular to the gradient of the tangent to the curve at the point P.

    The gradient of the tangent is just the curve's gradient at that point.

    Does that clear it up?
 
 
 
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