Question 248517
point (2,2) is 2sqrt2 from those three points
d=sqrt((x2-x1)^2 +(y2-y1)^2)

sqrt((4-2)^2 +(4-2)^2)=sqrt(4+4)=sqrt8=2sqrt2
sqrt((4-2)^2 +(0-2)^2)=sqrt(4+4)=sqrt8=2sqrt2
sqrt((0-2)^2 +(0-2)^2)=sqrt(4+4)=sqrt8=2sqrt2