The radius of the circle is from (0 to -2) on the plot, and it is:
[tex]\begin{gathered} 0-(-2) \\ 0+2 \\ 2\text{ units} \end{gathered}[/tex]
The radius of the circle is 2 units
The point of tangency is the point where the straight line touches the circle:
And it is on the coordinate -2 on the x-axis and coordinate 0 on the y-axis
In coordinate geometry, the point of tangency is represented thus: (-2,0)
The equation of a vertical line through this point is
[tex]x=-2[/tex]
