distance between two points in processing app?

I try to get the distance between two points in http://processing.org/ is like java but dont works: d = sqrt ((x2 - x1)**2 + (y2 - y1)**2); the distance formula is: http://www.purplemath.com/modules/xyplane/dist07b.gif
Math.pow() is about 10x more expensive than using x * x.

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