Circle Tangent to the $$y$$-Axis and Passing Through a Point
If the centre is $$(r,k)$$ and the circle passes through $$(x_1,y_1)$$:
$$(x_1-r)^2+(y_1-k)^2=r^2$$
Usage
- Used to determine a circle tangent to the $$y$$-axis and passing through a given point.