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Distance Formula
The distance formula can be obtained by creating a triangle and using the Pythagorean Theorem to find the length of the hypotenuse. The hypotenuse of the triangle will be the distance between the two points.

The subscripts refer to the first and second points; it doesn't matter which points you call first or second.

x2 and y2 are the x,y coordinates for one point
x1and y1 are the x,y coordinates for the second point
d is the distance between the two points

Related Links:
Geometry Tutorials
Using Distance Formula
Distance Formula Examples
Distance Formula Calculator

 

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