Talk:Equation of Straight Line Tangent to Circle

Point out here that $(x_n, y_n)$ is actually on the circle. Or can this be result be expanded to the general case where $(x_n, y_n)$ is outside the circle (two lines) and prove that there are no tangents to a point inside? - Prime.mover


 * I tried to work out a proof for this and asked my professor about it. She said that it can be used to prove that there are no tangents to a point inside, but she hasn't taught me how yet, and will get to it in a few months. What I have to do is prove that all the solutions to $\frac {\mathrm dy}{\mathrm dx}$ are on the $xy$-plane outside of the circle. I imagined a tangent line moving about the circle and filling in all the space that it crosses, and intuitively the filled space is everywhere on the plane outside the circle. --GFauxPas 09:55, 22 November 2011 (CST)


 * Should be high-school stuff but never mind (you get a square root of a negative number). Never mind. --prime mover 13:17, 22 November 2011 (CST)

Can someone please rename this page "tangent line to a circle? Thanks. --GFauxPas 12:20, 22 November 2011 (CST)