December 30, 2022

Distance Between Two Points - Formula, Derivation, Examples

The idea of distance is vital in both


and daily life. From simply measuring the length of a line to working out the shortest route within two extremities, comprehending the length between two points is vital.

In this article, we will take a look at the formula for distance within two points, go through some examples, and discuss realistic utilizations of this formula.

The Formula for Distance Between Two Points

The distance between two locations, usually denoted as d, is the length of the line segment linking the two points.

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

The formula for the Pythagorean theorem is a2 + b2 = c2. As a result, √c2 will equal the distance, d.

In the case of finding the length between two points, we can represent the points as coordinates on a coordinate plane. Let's assume we have point A with coordinates (x1, y1) and point B at (x2, y2).

We can then use the Pythagorean theorem to extract the following formula for distance:

d = √((x2 - x1)2 + (y2 - y1)2)

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

Here is a visual illustration:

Examples of Using the Distance Formula

Considering we possess the formula for distance, let's look at some examples of how it can be used.

Calculating the Distance Among the Two Points on a Coordinate Plane

Suppose we have two points 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 distance between points A and B is 5 units.

Calculating the Length Among Two Points on a Map

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

To work out the distance between two locations on the map, such as the city hall and the airport, we could easily measure the distance among the two points utilizing a ruler and convert the measurement to miles using the map's scale.

While we calculate the length within these two points 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 between the city hall and the airport is 20 miles.

Determining the Length Within Two Locations in Three-Dimensional Space

In addition to calculating distances in two dimensions, we could also utilize the distance formula to work out the distance among two points in a three-dimensional space. For example, suppose we have two points, A and B, in a three-dimensional space, with coordinates (x1, y1, z1) and (x2, y2, z2), respectively.

We will use the distance formula to figure out the length between these two points as follows:

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

Utilizing this formula, we could calculate the distance between any two points in three-dimensional space. For instance, if we possess two points A and B with coordinates (1, 2, 3) and (4, 5, 6), each, we could work out the distance between them as follows:

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 distance between locations A and B is just about 3.16 units.

Utilizations of the Distance Formula

Now once we have observed some examples of utilizing the distance formula, let's explore few of its Utilizations in math and other areas.

Calculating Distances in Geometry

In geometry, the distance formula is used to work out the length of line segments and the sides of triangles. For example, in a triangle with vertices at points A, B, and C, we utilize the distance formula to figure out the distances of the sides AB, BC, and AC. These lengths can be used to calculate other characteristics of the triangle, such as its area, perimeter and its interior angles.

Solving Problems in Physics

The distance formula is also utilized in physics to work out problems involving speed, distance and acceleration. For instance, if we know the first position and velocity of an object, also the time it takes for the object to move a certain distance, we could use the distance formula to work out the object's ultimate location and speed.

Analyzing Data in Statistics

In statistics, the distance formula is usually utilized to calculate the distances between data points in a dataset. This is beneficial for clustering algorithms, that group data points which are near 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 essential concept in mathematics that enables us to figure out the within two location on a plane or in a three-dimensional space. By utilizing the Pythagorean theorem, we could derive the distance formula and apply it to a assortments of situations, from measuring length on a coordinate plane to analyzing data in statistics.

Comprehending the distance formula and its applications are important for anyone interested in mathematics and its applications in other areas. If you're having difficulties regarding the distance formula or any other mathematical concept, contact Grade Potential tutoring for tailored assistance. Our expert tutors will help you master any math topic, from algebra to calculus and furthermore.

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