lineNL is tangent to circle M at point N.
What is the measure of ∠MLN?
A tangent drawn to a circle meets a radius at right angle....so angle MNL = 90°
So......the other two angles sum to 90°
angle NML + angle MLN = 90
71 + angle MLN = 90 subtract 71 from both sides
angle MLN = 19°
+164 
