One formula to rule them all, one formula to find them. One formula to bring them all, and in the darkness bind them. Or something like that. In coordinate geometry, the way to find the distance between two points is to use the distance formula. All you do is plug in the points, and you've got yourself the distance.

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Plotting Points in 3D 
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Graphing Linear Inequalities on a Coordinate Plane 
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Coordinates and Distance Formula 
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Midsegment Theorem 
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Collinearity 
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Finding the Distance Between Two Points 
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ACT Math 2.2 Coordinate Geometry