December 30, 2022

Distance Between Two Points - Formula, Derivation, Examples

The concept of distance is vital in both


and daily life. From straightforward measuring the extent of a line to calculating the shortest route between two locations, understanding the distance between two points is important.

In this article, we will take a look at the formula for distance within two locations, work on a few examples, and discuss realistic uses of this formula.

The Formula for Length Within Two Locations

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

Mathematically, this can be represented by drawing a right triangle and utilizing the Pythagorean theorem. According to Pythagorean theorem, the square of the length of the longest side (the hypotenuse) is equivalent to the sum of the squares of the distances of the two other sides.

The formula for the Pythagorean theorem is a2 + b2 = c2. As a consequence, √c2 will as same as the length, d.

In the circumstance of working out the length within two locations, we can portray 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 could thereafter employ the Pythagorean theorem to derive the following formula for distance:

d = √((x2 - x1)2 + (y2 - y1)2)

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

Here is a visual representation:

Examples of Utilizations of the Distance Formula

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

Working out the Distance Within Two Locations on a Coordinate Plane

Assume we have two locations on a coordinate plane, A with coordinates (3, 4) and B with coordinates (6, 8). We will use the distance formula to calculate 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

Hence, the span within points A and B is 5 units.

Calculating the Length Within Two Locations on a Map

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

To find the length between two locations on the map, for instance the airport and the city hall, we can easily work out the length between the two locations utilizing a ruler and convert the measurement to miles using the map's scale.

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

Working out the Length Between Two Locations in Three-Dimensional Space

In addition to calculating distances in two dimensions, we could further utilize the distance formula to calculate the distance between two points 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 utilize the distance formula to figure out the distance between these two points as ensuing:

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

Using this formula, we could identify the distance within any two points in three-dimensional space. For instance, if we have two locations A and B with coordinates (1, 2, 3) and (4, 5, 6), respectively, we could figure out the distance within 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 between points A and B is approximately 3.16 units.

Utilizations of the Distance Formula

Now once we have looked at some instances of utilizing the distance formula, let's explore some of its Utilizations in mathematics and other fields.

Calculating Distances in Geometry

In geometry, the distance formula is used to measure the length 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 lengths could be employed to calculate other properties of the triangle, such as its interior angles, area, perimeter.

Solving Problems in Physics

The distance formula is further utilized in physics to work out problems concerning distance, speed, and acceleration. For instance, if we recognize the initial location and velocity of an object, in addition to the time it requires for the object to move a specific distance, we could utilize the distance formula to calculate the object's final position and speed.

Analyzing Data in Statistics

In statistics, the length formula is frequently utilized to workout the distances between 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, this represent high-dimensional data in a lower-dimensional space.

Go the Distance with Grade Potential

The distance formula is an important theory in math that allows us to work out the length between two points on a plane or in a three-dimensional space. By utilizing the Pythagorean theorem, we can extract the distance formula and implement it to a magnitude of scenarios, from measuring distances on a coordinate plane to analyzing data in statistics.

Understanding the distance formula and its utilizations are crucial for anyone fascinated in math and its uses in other fields. If you're struggling with the distance formula or any other mathematical theories, connect with Grade Potential tutoring for personalized assistance. Our professional instructors will support you conquer any math topic, from algebra to calculus and furthermore.

Connect with us right now to learn more and schedule your first tutoring session.