Question 174908
The general formula for determining the distance between two points is

Square Root[(y2-y1)^2 + (x2-x1)^2]

with x1 = 1
     x2 = -3
     y1 = 2
     y2 = -1

Substituting the values into the gnereal formula, we have

   Square Root[(-1-2)^2+(-3-1)^2] = Square Root[9+16]=Square Root[25]=5

I hope that helps.

Good luck