Find the distance between two sets in $\mathbb E^2$ Find the distance between two sets in $\mathbb E^2$:
P = {$(x,y): x+2y = 4$} and K = {$(x,y): $$(x+1)^2 + (y+1)^2 = 1$}
Need some help with this one

The hint:
It's just
$$\frac{|1\cdot(-1)+2\cdot(-1)-4|}{\sqrt{1^2+2^2}}-1.$$
