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Math Help - Equation of Tangent Line Through Point

  1. #1
    Senior Member nycmath's Avatar
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    Equation of Tangent Line Through Point

    Let (x1,y1) be one of the points of tangency. Show that the equation of the tangent line through this point is x1(x) + y1(y) = R^2

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  2. #2
    MHF Contributor
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    Re: Equation of Tangent Line Through Point

    (x, y) is on the tangent iff (x, y) - (x1, y1) is perpendicular to (x1, y1). Express this condition using dot product.
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