How to Find the Distance Between Two Points

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Think of the distance between any two points as a line. The length of this line can be found by using the distance formula: .

Things You Should Know

  • Jot down the coordinates that you're measuring the distance between.
  • Plug these coordinates into the distance formula: .
  • Solve the formula by squaring the differences of the x and y values, adding these differences together, and finding the square root of the remaining sum.

Steps

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  1. Call one point Point 1 (x1,y1) and make the other Point 2 (x2,y2). It does not terribly matter which point is which, as long as you keep the labels (1 and 2) consistent throughout the problem. [1]
    • x1 is the horizontal coordinate (along the x axis) of Point 1, and x2 is the horizontal coordinate of Point 2. y1 is the vertical coordinate (along the y axis) of Point 1, and y2 is the vertical coordinate of Point 2.
    • For an example, take the points (3,2) and (7,8). If (3,2) is (x1,y1), then (7,8) is (x2,y2).
  2. Know the distance formula . This formula finds the length of a line that stretches between two points: Point 1 and Point 2. The linear distance is the square root of the square of the horizontal distance plus the square of the vertical distance between two points. [2] More simply put, it is the square root of:
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  3. First, subtract y2 - y1 to find the vertical distance. Then, subtract x2 - x1 to find the horizontal distance. Don't worry if the subtraction yields negative numbers. The next step is to square these values, and squaring always results in a positive number. [3]
    • Find the distance along the y-axis. For the example points (3,2) and (7,8), in which (3,2) is Point 1 and (7,8) is Point 2: (y2 - y1) = 8 - 2 = 6. This means that there are six units of distance on the y-axis between these two points.
    • Find the distance along the x-axis. For the same example points (3,2) and (7,8): (x2 - x1) = 7 - 3 = 4. This means that there are four units of distance separating the two points on the x-axis.
  4. Square both values. This means that you will square the x-axis distance (x2 - x1), and that you will separately square the y-axis distance (y2 - y1).
  5. Add the squared values together. This will give you the square of the diagonal, linear distance between your two points. In the example of the points (3,2) and (7,8), the square of (8 - 2) is 36, and the square of (7 - 3) is 16. 36 + 16 = 52.
  6. Take the square root of the equation. This is the final step in the equation. The linear distance between the two points is the square root of the sum of the squared values of the x-axis distance and the y-axis distance. [4]
    • To carry on the example: the distance between (3,2) and (7,8) is sqrt (52), or approximately 7.21 units.
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Calculator, Practice Problems, and Answers

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  • Question
    How do I find the horizontal distance between (3, 4) and (8, 4)?
    Community Answer
    Subtract 3 from 8 since both are at 4 on the y axis. So distance is: 8-3=5.
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  • Question
    What is the distance from the x-axis to (7,-2)?
    Community Answer
    This is an ambiguous question. I will assume you mean the shortest distance. Then, your second point will be (7,0) because the line that goes through (7,0) and (7,-2) is perpendicular to the x-axis. So your answer is 2.
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    Not Helpful 69 Helpful 56
  • Question
    What is the distance between (2, 3) and (-8,12)?
    Community Answer
    Using the distance formula shown in the above article, find the horizontal distance between the two points by subtracting (-8) from 2, which is 10. Then find the vertical distance between the points by subtracting 12 from 3, which is -9. We then add together the squares of those two distances: 3² + (-9)² = 9 + 81 = 90. Find the square root of that sum: √90 = 9.49. That's the distance (in "units") between the two points.
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      • It doesn't matter if you get a negative number after subtracting y2 - y1 or x2 - x1. Because the difference is then squared, you will always get a positive distance in your answer. [5]
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      References

      1. ↑ http://www.purplemath.com/modules/distform.htm
      2. ↑ http://mathsfirst.massey.ac.nz/Algebra/PythagorasTheorem/pythapp.htm
      3. ↑ http://www.mathwarehouse.com/algebra/distance_formula/index.php
      4. ↑ https://www.mathsisfun.com/algebra/distance-2-points.html
      5. ↑ https://www.skillsyouneed.com/num/positive-negative.html

      About This Article

      Article Summary X

      To find the distance between two points on a line, take the coordinates of the two points. Label one as Point 1, with the coordinates x1 and y1, and label the other Point 2, with the coordinates x2 and y2. Plug these values into the distance formula, which is the square of X2 minus X1 plus the square of Y2 minus Y1, then the square root of that result. To see the distance formula written out, read on!

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