What is a straight line distance between two points?

Answer 1

If we assume a 2D topography with XX and YY axes, we can write any two points on that surface as p(x,y) and P(X,Y) where x, X, y, and Y are the coordinates of each point.

So the distance between p and P is S = sqrt(Sx^2 + Sy^2) where Sx = X - x and Sy = Y - y.

EX: Assume p(2,4) and P(4,9); then we have S = sqrt((4 - 2)^2 + (9 - 4)^2) = 5.39 units. ANS.