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Can Anyone Identify This Math Equation?

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I've forgotten a lot of math knowledge, so forgive me for my stupidity!

I'm trying to understand a bit of physics code relating to simple collision detection of circles in a game/simulation, and I see an important equation here, and I don't know what it's supposed to be doing. Can anyone identify it? It looks very familiar and simple, but I can't remember what it's for!

SQRT( (x1-x2)^2 + (y1-y2)^2 )

Here it is in python code..

if math.sqrt(  ((Circle.x-Circle2.x)**2)  +  ((Circle.y-Circle2.y)**2)  ) <= (Circle.radius+Circle2.radius):

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