Public Function SquareDistance( _
   ByVal other As Coordinate _
) As Double

public double SquareDistance( 
   Coordinate other
)

Parameters

other

The coordinate to calculate distance from this coordinate.

Return Value

The square distance between the two coordinates.

Square distance is defined as dx*dx+dy*dy, where dx and dy are the differences in x and y of the two compared coordinates.

This is a more efficient way to compare distance to other geometries because it avoids a square root operation.

Reference