Finding the equation of the tangent to a circle
Lesson 17 / 17
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Lesson outcome
I can find the equation of the tangent to a circle at any given point.
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Using the gradient of the radius through a given point, you can find the equation of the tangent at this same point.
You have already proved that the tangent at any point on a circle is perpendicular to the radius at that point.
You have already proved that the product of the gradients of two perpendicular lines is -1
Using the gradient of the tangent and the coordinates of the point, you can find the equation of the tangent.
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