Determine the distance between point (x1, y1) and point (x2, y2), and assign the result to pointsDistance.?

The calculation is:
Distance = SquareRootOf( (x2 - x1)2 + (y2 - y1)2 )
You may declare additional variables.
Ex: For points (1.0, 2.0) and (1.0, 5.0), pointsDistance is 3.0.
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