December 30, 2022

Distance Between Two Points - Formula, Derivation, Examples

The theory of distance is crucial in both


and routine life. From easily measuring the extent of a line to calculating the quickest route within two points, comprehending the length between two points is vital.

In this blog, we will take a look at the formula for distance between two points, work on some examples, and talk about real-life utilizations of this formula.

The Formula for Distance Between Two Points

The length among two locations, frequently denoted as d, is the extent of the line segment linking the two locations.

In math, this can be portrayed by drawing a right triangle and utilizing the Pythagorean theorem. Per the Pythagorean theorem, the square of the distance of the extensive side (the hypotenuse) is equal to the total of the squares of the distances of the two other sides.

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

In the case of finding the length within two locations, we can represent the extremities 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 then employ the Pythagorean theorem to extract the following formula for distance:

d = √((x2 - x1)2 + (y2 - y1)2)

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

Here is a visual depiction:

Examples of Utilizations of the Distance Formula

Now that we have the formula for distance, let's look at few examples of how it can be utilized.

Finding the Distance Between Two Locations on a Coordinate Plane

Imagine we possess two locations on a coordinate plane, A with coordinates (3, 4) and B with coordinates (6, 8). We will employ the distance formula to figure out the distance within these two locations as follows:

d = √((6 - 3)2+ (8 - 4)2)

d = √(32 + 42)

d = √(9 + 16)

d = √(25)

d = 5

Therefore, the distance within points A and B is 5 units.

Calculating the Length Within Two Points on a Map

In addition to finding length on a coordinate plane, we can further use the distance formula to work out lengths between two locations on a map. For example, assume we posses a map of a city with a scale of 1 inch = 10 miles.

To figure out the distance between two points on the map, for instance the airport and the city hall, we could simply calculate the distance within the two locations employing a ruler and change the measurement to miles utilizing the map's scale.

Once we measure the length within these two locations on the map, we figure out it is 2 inches. We convert this to miles using the map's scale and find out that the real length among the city hall and the airport is 20 miles.

Calculating the Length Within Two Locations in Three-Dimensional Space

In addition to finding lengths in two dimensions, we could further utilize the distance formula to work out the length between two locations in a three-dimensional space. For instance, assume we have two points, A and B, in a three-dimensional space, with coordinates (x1, y1, z1) and (x2, y2, z2), respectively.

We will employ the distance formula to figure out the length within these two points as ensuing:

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

Utilizing this formula, we could determine the length among any two locations in three-dimensional space. For instance, if we have two points A and B with coordinates (1, 2, 3) and (4, 5, 6), individually, we could work out the distance 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

Hence, the length within points A and B is roughly 3.16 units.

Applications of the Distance Formula

Now that we have observed few instances of using the distance formula, let's examine few of its applications in mathematics and other fields.

Calculating Length in Geometry

In geometry, the distance formula is utilized 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 utilize the distance formula to find the distances of the sides AB, BC, and AC. These lengths can be utilized to calculate other characteristics of the triangle, such as its interior angles, area, perimeter.

Solving Problems in Physics

The distance formula is further used in physics to work out problems comprising distance, speed, and acceleration. For example, if we perceive the initial position and velocity of an object, in addition to the time it takes for the object to transport a specific length, we could utilize the distance formula to figure out the object's ultimate location and speed.

Analyzing Data in Statistics

In statistics, the distance formula is frequently used to calculate the length within data points in a dataset. This is beneficial for clustering algorithms, which segregate data points that are close to each other, and for dimensionality reduction techniques, which depicts high-dimensional data in a lower-dimensional space.

Go the Distance with Grade Potential

The distance formula is an essential concept in math which allows us to figure out the between two points on a plane or in a three-dimensional space. By using the Pythagorean theorem, we could obtain the distance formula and apply it to a variety of situations, from calculating distances on a coordinate plane to analyzing data in statistics.

Comprehending the distance formula and its uses are crucial for anyone fascinated in math and its uses in other areas. If you're having difficulties regarding the distance formula or any other mathematical concept, connect with Grade Potential tutoring for customized assistance. Our experienced teachers will assist you conquer any math topic, from algebra to calculus and beyond.

Call us right now to know more and schedule your first tutoring session.