Question 309373
Use the distance formula
{{{D^2=(x2-x1)^2+(y2-y1)^2}}}
{{{D^2=(-10-6)^2+(4-12)^2}}}
{{{D^2=256+64}}}
{{{D^2=320}}}
{{{D=sqrt(320)}}}
{{{D=sqrt(4*4*4*5)}}}
{{{D=8*sqrt(5)}}}