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This online calculator find distance and midpoint between two points in cartesian coordinates. The formulas are very simple: for two given points and distance is the hypotenuse of right triangle, and it is calculated like this: and middle point is the average of both coordinates .
However, this calculator also displays the line on the graph (in blue), and shows graphical way to find a midpoint - you draw two half-circles from both ends with radius equals to distance between them, then draw line connecting circles intersections. That line intersects with the original line at the midpoint.