December 30, 2022

Distance Between Two Points - Formula, Derivation, Examples

The theory of distance is vital in both


and routine life. From simply measuring the extent of a line to figuring out the shortest route within two extremities, comprehending the distance between two points is vital.

In this blog, we will inspect the formula for distance between two points, go through a few examples, and discuss real-life applications of this formula.

The Formula for Distance Within Two Points

The length between two points, often signified as d, is the extent of the line segment linking the two extremities.

Mathematically, this can be depicted by drawing a right triangle and using the Pythagorean theorem. As stated in the Pythagorean theorem, the square of the distance of the longest side (the hypotenuse) is equal to the total of the squares of the lengths of the two other sides.

The formula for the Pythagorean theorem is a2 + b2 = c2. Consequently, √c2 will equal the length, d.

In the circumstance of working out the length between two locations, we can portray the points as coordinates on a coordinate plane. Let's say we have point A with coordinates (x1, y1) and point B at (x2, y2).

We can thereafter employ the Pythagorean theorem to extract the following formula for distance:

d = √((x2 - x1)2 + (y2 - y1)2)

In this formula, (x2 - x1) depicts the distance on the x-axis, and (y2 - y1) depicts the length along y-axis, creating a right angle. By considering the square root of the sum of their squares, we obtain the distance between the two extremities.

Here is a graphical representation:

Examples of Utilizations of the Distance Formula

Considering we have the formula for distance, let's check out some instances of how it can be used.

Finding the Distance Within Two Locations on a Coordinate Plane

Suppose we have two extremities on a coordinate plane, A with coordinates (3, 4) and B with coordinates (6, 8). We will use the distance formula to figure out the distance within these two points as ensues:

d = √((6 - 3)2+ (8 - 4)2)

d = √(32 + 42)

d = √(9 + 16)

d = √(25)

d = 5

Consequently, the distance between points A and B is 5 units.

Calculating the Distance Among Two Locations on a Map

In addition to figuring out the distances on a coordinate plane, we could further utilize the distance formula to calculate lengths between two locations on a map. For instance, suppose we have a map of a city with a scale of 1 inch = 10 miles.

To find the length between two points on the map, such as the airport and the city hall, we can easily work out the length among the two points using a ruler and convert the measurement to miles using the map's scale.

When we calculate the length among these two locations on the map, we figure out it is 2 inches. We change this to miles utilizing the map's scale and find out that the true distance among the airport and the city hall is 20 miles.

Working out the Distance Within Two Points in Three-Dimensional Space

In addition to finding distances in two dimensions, we could also use the distance formula to work out the distance between two locations in a three-dimensional space. For example, suppose we possess two points, A and B, in a three-dimensional space, with coordinates (x1, y1, z1) and (x2, y2, z2), individually.

We will utilize the distance formula to work out the length between these two points as follows:

d = √((x2 - x1)2 + (y2 - y1)2 + (z2 - z1)2)

Utilizing this formula, we could identify the distance among any two points in three-dimensional space. For example, if we possess two points A and B with coordinates (1, 2, 3) and (4, 5, 6), respectively, we can find the length between them as ensues:

d = √((4 - 1)2 + (5 - 2)2 + (6 - 3)2)

d = √(32 + 32 + 32)

d = √(9 + 9 + 9)

d = √(27)

d = 3.16227766

Therefore, the length within points A and B is approximately 3.16 units.

Applications of the Distance Formula

Now that we have looked at some examples of using the distance formula, let's study few of its applications in mathematics and other fields.

Measuring Length in Geometry

In geometry, the distance formula is used to work out the distance of line segments and the sides of triangles. For instance, in a triangle with vertices at points A, B, and C, we use the distance formula to find the lengths of the sides AB, BC, and AC. These distances could be used to measure other characteristics of the triangle, for example its area, perimeter and its interior angles.

Solving Problems in Physics

The distance formula is further used in physics to solve questions comprising speed, distance and acceleration. For example, if we perceive the first position and velocity of an object, also the time it requires for the object to move a specific length, we could use the distance formula to work out the object's concluding position and speed.

Analyzing Data in Statistics

In statistics, the length formula is often used to figure out the distances between data points in a dataset. This is useful for clustering algorithms, which segregate data points which are near to each other, and for dimensionality reduction techniques, which portrays high-dimensional data in a lower-dimensional space.

Go the Distance with Grade Potential

The distance formula is ac crucial theory in mathematics that allows us to calculate the distance within two points on a plane or in a three-dimensional space. By utilizing the Pythagorean theorem, we could obtain the distance formula and implement it to a magnitude of scenarios, from calculating length on a coordinate plane to analyzing data in statistics.

Understanding the distance formula and its uses are important for anyone interested in math and its applications in other fields. If you're having difficulties regarding the distance formula or any other math theories, contact Grade Potential tutoring for personalized assistance. Our expert teachers will assist you conquer any mathematics topic, from algebra to calculus and furthermore.

Contact us today to know more and schedule your first tutoring session.