distance between (3,10) and (-4,31)
(3,10)(-4,31)distance = sqrt (x2 - x1)^2 + (y2 - y1)^2distance = sqrt (-4 - 3)^2 + (31 - 10)^2distance = sqrt (-7^2 + 21^2)distance = sqrt (49 + 441)distance = sqrt 490distance = 7 sqrt 10 or 22.14
