# 3 Easy Steps for Answering What are Vertical Angles?

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### Key Points about Vertical Angles

- Vertical angles are angles that are opposite each other when two lines intersect.
- Vertical angles are congruent, meaning they have the same angle measurement or size.
- Understanding vertical angles is important for solving geometry problems and has real-world applications in architecture and engineering.

## Here’s how to solve Vertical Angles

Vertical angles are a fundamental concept in geometry that are often taught in middle school. They are formed when two lines intersect, creating four angles. The angles that are opposite each other are known as vertical angles. These angles have a unique relationship that is important to understand when studying geometry.

One of the key properties of vertical angles is that they are congruent. This means that they have the same angle measurement or size. For example, if one vertical angle measures 60 degrees, then its opposite angle will also measure 60 degrees. This property can be proven mathematically using the Vertical Angles Theorem.

Understanding vertical angles is essential for solving geometry problems involving intersecting lines. It is also useful for real-world applications, such as in architecture and engineering. In the following sections, we will explore the definition of vertical angles, the Vertical Angles Theorem, and provide examples to help illustrate this concept.

Vertical Angles are angles that are created by the intersection of two lines. When two lines intersect they form four angles. The four angles have two sets of Vertical Angles, which are the angles that are located diagonally across from each other. The angles that are located diagonally across from each other will be Vertical Angles and these angles will be congruent. This means that they will have the same angle measure. When angles are Vertical Angles they will have the same angle measure and will always be congruent.

**Common Core Standard: **7.G.5**Related Topics: **Area of a Circle, Area of a Semicircle, Circumference of a Circle, Perimeter of a Semicircle, Complementary Angles, Supplementary Angles**Return To: **Home, 7th Grade

## Are Vertical Angles Congruent?

When two lines intersect, they form four angles. Vertical angles are pairs of opposite angles that are formed by intersecting lines. These angles are called vertical angles because they share the same vertex and are opposite each other. The question is, are these vertical angles congruent?

According to the Vertical Angles Theorem, vertical angles are always congruent. This means that the measure of one angle is equal to the measure of its vertical angle. In other words, if angle A and angle B are vertical angles, then angle A is congruent to angle B.

This theorem can be proved using the properties of parallel lines. When two parallel lines are intersected by a transversal, the alternate interior angles are congruent. Since vertical angles are opposite angles, they are formed by intersecting lines that are not parallel. However, they still share the same properties as alternate interior angles, which is why they are always congruent.

It’s important to note that vertical angles are not the same as adjacent angles or complementary angles. Adjacent angles are angles that share a common vertex and side, while complementary angles are angles that add up to 90 degrees. Vertical angles, on the other hand, are opposite angles that share a vertex and are formed by intersecting lines.

In summary, vertical angles are always congruent. This is because they share the same properties as alternate interior angles, even though they are formed by intersecting lines that are not parallel. Understanding the properties of vertical angles is important in geometry, as it helps to solve problems involving intersecting lines and angles.

## Vertical Angles Definition in Geometry

In geometry, vertical angles are defined as the angles opposite each other when two lines intersect. They are formed by two intersecting lines, and their vertices are located at the point of intersection. The term “vertical” refers to the fact that these angles share the same vertex, but they are not necessarily oriented vertically.

### Adjacent Angles

Adjacent angles are angles that share a common vertex and a common side but do not overlap. In the case of vertical angles, adjacent angles are supplementary, which means that their sum is equal to 180 degrees. This can be seen in the diagram below:

### Supplementary Angles

Supplementary angles are two angles whose sum is 180 degrees. In the case of vertical angles, they are also adjacent angles. This means that if one angle measures x degrees, then the other angle measures 180 – x degrees. This relationship can be seen in the diagram below:

### Complementary Angles

Complementary angles are two angles whose sum is 90 degrees. In the case of vertical angles, they are not complementary. However, if we consider a pair of adjacent angles that form a linear pair (i.e., they are adjacent and their non-common sides form a straight line), then they are complementary. This can be seen in the diagram below:

In summary, vertical angles are defined as the angles opposite each other when two lines intersect. They are always congruent, which means that they have the same measure. Adjacent vertical angles are supplementary, while adjacent angles that form a linear pair are complementary. These relationships can be used to solve problems involving angles in geometry.

## 3 Simple Vertical Angles Examples

Vertical angles are angles formed by two intersecting lines. In this section, we will explore some examples of vertical angles in different geometric shapes.

- Identify which angles are Vertical Angles.
- You can locate Vertical Angles by seeing which angles are located diagonally across from each other at the intersection of two lines.
- The Vertical Angles will have congruent angle measures.

### Vertical Angles in Parallel Lines

When two parallel lines are intersected by a transversal, vertical angles are formed. These angles are congruent, meaning they have the same measure. The following diagram shows an example of vertical angles in parallel lines:

### Vertical Angles in Circles

Vertical angles can also be found in circles. When two chords intersect inside a circle, four angles are formed. The opposite angles are vertical angles and are congruent. The following diagram shows an example of vertical angles in a circle:

### Vertical Angles in Triangles

Vertical angles can also be found in triangles. When two intersecting lines create a triangle, the angles opposite each other are vertical angles and are congruent. The following diagram shows an example of vertical angles in a triangle:

Overall, vertical angles can be found in a variety of geometric shapes and are always congruent. Understanding vertical angles is important in geometry and can help solve problems involving angles and intersecting lines.

## Vertical Angles Theorem Explained

The Vertical Angles Theorem is a fundamental theorem in geometry that describes the relationship between vertical angles. It states that when two lines intersect, the vertical angles formed by the intersection are always congruent. In other words, they have the same measure.

To understand the theorem, it is important to first define what vertical angles are. Vertical angles are a pair of non-adjacent angles formed by two intersecting lines. They are opposite each other and share a common vertex, but do not share a common side.

The theorem can be stated mathematically as follows: if angle A and angle B are vertical angles, then angle A is congruent to angle B. This can be written as A ≅ B.

The Vertical Angles Theorem is easy to prove using basic geometry principles. Consider two intersecting lines, AB and CD, that form four angles: angle 1, angle 2, angle 3, and angle 4. Angle 1 and angle 2 are adjacent angles, as are angle 2 and angle 3, angle 3 and angle 4, and angle 4 and angle 1. However, angles 1 and 3, and angles 2 and 4, are vertical angles.

By definition, vertical angles are opposite each other and share a common vertex. Therefore, angles 1 and 3 are congruent, as are angles 2 and 4. This can be written as angle 1 ≅ angle 3 and angle 2 ≅ angle 4. Since the angles are congruent, they have the same measure.

The Vertical Angles Theorem has important applications in geometry, particularly in the study of angles and triangles. For example, it can be used to prove that the sum of the angles in a triangle is 180 degrees. It is also used in the construction of geometric proofs and in the calculation of angles in various geometric shapes.

In summary, the Vertical Angles Theorem states that when two lines intersect, the vertical angles formed by the intersection are always congruent. This theorem is fundamental to the study of geometry and has important applications in various areas of mathematics.

## FAQ about Vertical Angles

### What are Vertical Angles in Geometry?

In geometry, vertical angles are the angles that are opposite to each other when two lines intersect. They share the same vertex or corner point, but not any sides. An example of vertical angles is ∠A and ∠B in the following diagram:

### How do you identify vertical angles?

To identify vertical angles, you need to look for two angles that share the same vertex or corner point but are not adjacent. In other words, they are opposite to each other when two lines intersect.

### Are vertical angles complementary or supplementary?

Vertical angles are neither complementary nor supplementary. Complementary angles add up to 90 degrees, while supplementary angles add up to 180 degrees. Vertical angles are always congruent, which means they have the same measure.

### Are Vertical Angles Congruent?

Yes, vertical angles are always congruent. This means that they have the same measure or angle degree. For example, if one vertical angle measures 70 degrees, the other vertical angle will also measure 70 degrees.

### Do vertical angles equal 360?

No, vertical angles do not equal 360 degrees. They only measure the same angle degree, which means they are congruent. Vertical angles are opposite to each other when two lines intersect, but they do not form a complete circle.

### Do vertical angles add up to 180?

No, vertical angles do not add up to 180 degrees. They are congruent, which means they have the same measure or angle degree. However, they are not adjacent angles, and therefore, they do not add up to 180 degrees.

### Why are vertical angles always congruent?

Vertical angles are always congruent because they are formed by intersecting lines. When two lines intersect, they form four angles, and the opposite angles are always congruent. This is a mathematical property that is true for all intersecting lines, regardless of their orientation or direction.

## Vertical Angles Worksheet Video Explanation

Watch our free video on how to solve for **Vertical Angles**. This video shows how to solve problems that are on our free **Vertical Angle** worksheet that you can get by submitting your email above.

**Watch the free Vertical Angles video on YouTube here: Vertical Angles Video**

**Video Transcript:**

This video is about answering the question what are vertical angles. You can get the vertical angles worksheets used in this video for free by clicking on the link in the description below.

The first part of the vertical angles definition is to identify that the two angles that are directly across from each other, so we’ll say angle x here and angle x here, these two angles are going to be vertical. And the other two angles are also vertical but they’re vertical with each other. When solving for vertical angles, the angles that are vertical are congruent. That means that they are equal. So in the case of this example if this angle right here was 45 degrees that means that this angle because it’s the vertical angle also has to be 45 degrees because it’s equal. Then if this angle was 135 degrees that means that this angle also has to be 135 degrees. Let’s do a couple practice problems on our vertical angles worksheet.

We already know that the vertical angle definition is that the two angles that are crossed from each other and are formed by two lines that cross they are going to be congruent. In the case of problem number one, we know that 140 degrees is directly across from x and because that they are directly across from each other that means that they’re vertical. If this one’s 140 degrees that means that x also has to be 140 degrees. We can do the same thing for angle y. So we don’t know angle y but we do know it’s vertical with 40 degrees and because they’re vertical that means that they’re exactly the same. This is 40 that means that angle y also has to be 40 degrees.

Number two on our vertical angles practice worksheet gives us two missing angles x and y and also that one angle is 55 degrees and the other angle is 125 degrees we know that angles directly across from each other are vertical so if this x is vertical with 125 degrees we know that x has to be 125 degrees and if this angle y which we do not know but is vertical with an angle that is 55 degrees that means that y also has to be 55 degrees hopefully this video helped you answer the question what are vertical angles.

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