# Linear Pair of AnglesDefinition, Axiom, Examples

The linear pair of angles is a significant concept in geometry. With so many real-world functions, you'd be surprised to figure out how relevant this figure can be. While you might think it has no relevant in your life, we all must grasp the concept to nail those exams in school.

To save your time and create this information readily accessible, here is an preliminary insight into the properties of a linear pair of angles, with images and examples to assist with your private study sessions. We will also discuss some real-world and geometric applications.

## What Is a Linear Pair of Angles?

Linearity, angles, and intersections are concepts that exist to be relevant as you move ahead with geometry and more complex theorems and proofs. We will answer this question with a simple explanation in this single point.

### Explanation

A linear pair of angles is the term given to two angles that are positioned on a straight line and the total of their measurement of angles is 180 degrees.

To put it simply, linear pairs of angles are two angles that are adjacent on the same line and together form a straight line. The total of the angles in a linear pair will always produce a straight angle equivalent

times to 180 degrees.

It is important to bear in mind that linear pairs are at all times at adjacent angles. They share a common apex and a common arm. This suggests that they always form on a straight line and are at all times supplementary angles.

It is essential to explain that, even though the linear pair are at all times adjacent angles, adjacent angles never constantly linear pairs.

### The Linear Pair Axiom

Over the precise explanation, we will explore the two axioms earnestly to fully understand every example provided to you.

Initiate with definition of what an axiom is. It is a mathematical postulate or hypothesis that is accepted without having to prove; it is considered clear and self-evident. A linear pair of angles has two axioms associated with them.

The first axiom states that if a ray stands on a line, the adjacent angles will make a straight angle, also known as a linear pair.

The second axiom establishes that if two angles produces a linear pair, then uncommon arms of both angles makes a straight angle among them. In other words, they make a straight line.

## Examples of Linear Pairs of Angles

To imagine these axioms better, here are a few diagram examples with their corresponding answers.

### Example One

Here in this example, we have two angles that are adjacent to each other. As you can notice in the figure, the adjacent angles form a linear pair because the total of their measures equals 180 degrees. They are also supplementary angles, since they share a side and a common vertex.

Angle A: 75 degrees

Angle B: 105 degrees

Sum of Angles A and B: 75 + 105 = 180

### Example Two

In this example, we possess two lines intersect, creating four angles. Not all angles makes a linear pair, but respective angle and the one next to it form a linear pair.

∠A 30 degrees

∠B: 150 degrees

∠C: 30 degrees

∠D: 150 degrees

In this case, the linear pairs are:

∠A and ∠B

∠B and ∠C

∠C and ∠D

∠D and ∠A

### Example Three

This case presents convergence of three lines. Let's observe the axiom and characteristics of linear pairs.

∠A 150 degrees

∠B: 50 degrees

∠C: 160 degrees

None of the angle totals add up to 180 degrees. As a effect, we can conclude that this image has no linear pair until we extend a straight line.

## Implementations of Linear Pair of Angles

Now that we have learned what linear pairs are and have observed some instances, let's see how this theorem can be implemented in geometry and the real world.

### In Real-Life Scenarios

There are many uses of linear pairs of angles in real-world. One common example is architects, who apply these axioms in their day-to-day work to check if two lines are perpendicular and makes a straight angle.

Construction and Building professionals also employ expertise in this matter to make their work simpler. They employ linear pairs of angles to ensure that two adjacent walls create a 90-degree angle with the floor.

Engineers also apply linear pairs of angles regularly. They do so by figuring out the tension in beams and trusses.

### In Geometry

Linear pairs of angles as well perform a function in geometry proofs. A common proof that utilizes linear pairs is the alternate interior angles theorem. This concept states that if two lines are parallel and intersected by a transversal line, the alternate interior angles formed are congruent.

The proof of vertical angles additionally depends on linear pairs of angles. Even though the adjacent angles are supplementary and sum up to 180 degrees, the opposite vertical angles are at all times equal to each other. Because of previously mentioned two rules, you are only required to know the measure of one angle to work out the measurement of the rest.

The theorem of linear pairs is further employed for more complex applications, such as determining the angles in polygons. It’s important to understand the basics of linear pairs, so you are prepared for more complex geometry.

As shown, linear pairs of angles are a relatively simple concept with some fascinating applications. Later when you're out and about, take note if you can see some linear pairs! And, if you're attending a geometry class, be on the lookout for how linear pairs may be useful in proofs.

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