Question

a) Find the length of each radius (radius of circle M and radius of circle N).

b) What does "point of tangency" mean? And Identify the point of tangency.

c) Write the equation of the tangent line at this point.

Answer 1

A) From the graph,
.. radius of M is 1
.. radius of N is 3

B) The "point of tangency" is the one point where the circles and tangent line meet. That point is (2, 1).

C) The horizontal tangent line has equation
.. y = 1