¼ÐÃD: [Core] Tangent from external point [¥´¦L¥»¶] §@ªÌ: nanaliu ®É¶¡: 2016-8-11 12:51 PM ¼ÐÃD: Tangent from external point
Find the equation of the lines which pass through (3¡Ô 2, -3) and tangent to the circle x^2 + y^2 - 6x + 6¡Ô 2y + 24 = 0.
Find the points of intersecton between the lines and the circle also. nclose fromµª®×¡C
Sorry that only answer is provided for you because the steps is quite complicated. Here is an in¡Vc method.
Find the eqn.s of tangents to a circle froman external point
1.Let the eqn.s of tangents be y ¡V y_1 = m (x ¡V x_1 )
2.Simultaneous the equations
3.Putting discriminant=0