Determine the distance between point (x1, y1) and point (x2, y2), and assign the result to pointsDistance. The calculation is:

Ex: For points (1.0, 2.0) and (1.0, 5.0), pointsDistance is 3.0.

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pointsDistance = sqrt ((x2-x1) * 2.0 +(y2-y1) * 2.0);