You are calculating the length of a line segment
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If you mean points of (1, -2) and (-9, 3) then the distance is about 11 units using the distance formula
You are using Pythagoras's construction to find Euclid's distance.
Distance = (speed) x (time)
The difference in the distance formula and the pythagorean theorem is that the distance formula finds the distance between two points while the pythagorean theorem usually finds the hypotenuse of a right triangle.
Because a right angle triangle can be formed by the given coordinates and the length of the line is the hypotenuse of the triangle and so by using Pythagoras' theorem its length or distance can be found. Distance formula: square root of [(x1-x2)^2 plus (y1-y2)^2)]