Last updated on August 5th, 2025
In mathematics, the distance formula is used to determine the distance between two points in a plane. This formula is a direct application of the Pythagorean theorem. In this topic, we will learn the formula for calculating distance between two points in both coordinate geometry and on a number line.
The distance formula is a crucial concept in coordinate geometry. Let’s learn the formula to calculate the distance between two points in different contexts.
The distance between two points (x_1, y_1) and (x_2, y_2) in the Cartesian plane is given by: Distance} = √(x_2 - x_1)2 + (y_2 - y_1)2
The distance between two points a and b on a number line is given by the absolute difference: Distance} = |a - b|
In math and real life, we use the distance formula to calculate the straight-line distance between two points. Here are some important aspects of the distance formula:
It is used in navigation to find the shortest path between two locations.
In physics, it helps in calculating displacement. - In computer graphics, it is utilized for rendering images accurately.
Students often find the distance formula tricky to remember. Here are some tips and tricks to master it:
Visualize the distance formula as an application of the Pythagorean theorem.
Use mnemonics to remember: "Difference in x and y squared, sum them up, and take the square root."
Practice with real-life examples, like calculating the distance between two cities on a map.
In real life, the distance formula plays a major role in various fields. Here are some applications:
In navigation systems, to calculate the shortest route between two destinations. - In sports, to determine the distance covered by players during a game.
In architecture, for designing layouts and ensuring accurate measurements.
Students make errors when applying the distance formula. Here are some mistakes and ways to avoid them, to master it.
Find the distance between points (3, 4) and (7, 1)?
The distance is 5
Using the distance formula: \[ \sqrt{(7 - 3)^2 + (1 - 4)^2} = \sqrt{4^2 + (-3)^2} = \sqrt{16 + 9} = \sqrt{25} = 5 \]
What is the distance between points -5 and 3 on a number line?
The distance is 8
Using the absolute difference: \[ |-5 - 3| = |-8| = 8 \]
Calculate the distance between points (2, -1) and (5, 3)?
The distance is 5
Using the distance formula: √(5 - 2)2 + (3 + 1)2 = √(32 + 42) = √9 + 16 =√25 = 5
Find the distance from point 4 to point -2 on a number line.
The distance is 6
Using the absolute difference: |4 - (-2)| = |4 + 2| = 6
Jaskaran Singh Saluja is a math wizard with nearly three years of experience as a math teacher. His expertise is in algebra, so he can make algebra classes interesting by turning tricky equations into simple puzzles.
: He loves to play the quiz with kids through algebra to make kids love it.