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Home > PC > Chapter 8 > Lesson 8.2.1 > Problem 8-73


Two tangent lines are drawn on the circle , one at the point and the other at the point . What is the point of intersection for the two tangent lines?  

Find the equations of the tangents by using the point-slope form.
The slopes of the tangents are the reciprocals of the slopes of the corresponding radii multiplied by −1.

Set the two equations equal to each other and solve for the coordinates of the intersection.


Use the eTool below to help solve this problem by graphing.
Click the link at right for the full version of the eTool: 8-73 HW eTool