Hi everyone. I am having trouble with this question.
The tangent to a circle is prependicular to the radius at the point of contact.
Use this fact to show that the tangent to x^2 + y^2 = r^2 at the point (a,b)
has equation ax+by = r^2
btw: can someone please tell me how to enter superscripts so i don't have to use the ^ sign. Thank you