# Congruent Angles

#### Grade 8 Math Worksheets

**Congruent angles are angles that have the same measure. In other words, if two angles are congruent, they have the same degree of rotation and are the same size. Congruent angles are denoted by the symbol ≅.**

Table of Contents:

- Congruent Angles
- Formula for Congruent Angle
- Solved Examples of Congruent Angles
- FAQs

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## Congruent Angles

Congruent angles are angles that have the same measure. In other words, if two angles are congruent, they have the same degree of rotation and are the same size. Congruent angles are denoted by the symbol ≅. For example, if angle A and angle B have the same measure, we can write:

∠A ≅ ∠B

Congruent angles can be formed by various methods, including:

Using a protractor to measure the angles and verifying that they have the same measure.

Applying angle theorems and properties to prove that the angles are congruent.

Using geometric constructions to create congruent angles.

Congruent angles are important in geometry because they help us identify and describe the properties of shapes and figures. For example, in a triangle, if two angles are congruent, then the sides opposite those angles are also congruent. Congruent angles can also be used to prove that two shapes are similar, which means they have the same shape but may be different sizes.

## Formula for Congruent Angle

There is no specific formula for congruent angles, as congruency simply means that two angles have the same measure. However, there are some important properties and theorems related to congruent angles in geometry:

Vertical angles are congruent: Vertical angles are formed by two intersecting lines and are opposite to each other. They have the same measure and are always congruent.

Corresponding angles are congruent: Corresponding angles are formed when a transversal intersects two parallel lines. Corresponding angles that are on the same side of the transversal and in the same position relative to the parallel lines have the same measure and are congruent.

Alternate interior angles are congruent: Alternate interior angles are formed when a transversal intersects two parallel lines. Alternate interior angles that are on opposite sides of the transversal and inside the parallel lines have the same measure and are congruent.

Alternate exterior angles are congruent: Alternate exterior angles are formed when a transversal intersects two parallel lines. Alternate exterior angles that are on opposite sides of the transversal and outside the parallel lines have the same measure and are congruent.

In general, if we have two angles that we suspect are congruent, we can measure them with a protractor to verify that they have the same measure. Alternatively, we can use geometric theorems and properties to prove that they are congruent.

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## Solved Examples of Congruent Angles

If angle A measures 60 degrees, and angle B is another angle with the same measure, then we can write: ∠A ≅ ∠B. This means that angles A and B are congruent.

In a triangle, if two angles have the same measure, then they are congruent. For example, if angle A and angle B both measure 45 degrees, then we can write: ∠A ≅ ∠B. This means that angles A and B are congruent.

In a rectangle, opposite angles are congruent. For example, if angle A measures 80 degrees, then the opposite angle C also measures 80 degrees. We can write: ∠A ≅ ∠C. This means that angles A and C are congruent.

In a regular pentagon, all angles have the same measure. If the measure of one angle is 108 degrees, then we can write: ∠A ≅ ∠B ≅ ∠C ≅ ∠D ≅ ∠E. This means that all five angles of the pentagon are congruent.

In a pair of parallel lines intersected by a transversal, alternate interior angles are congruent. For example, if line AB is parallel to line CD, and a transversal EF intersects both lines, then we can write: ∠AFC ≅ ∠EBD. This means that the alternate interior angles are congruent.

Note that in all of these examples, the congruent angles have the same measure, and we can use the ≅ symbol to show that they are congruent.

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## Congruent Angles FAQS

##### What is the difference between congruent angles and similar angles?

Congruent angles have the same measure, while similar angles have the same shape but may have different measures. For example, two angles that both measure 60 degrees are congruent, while two angles that have the same shape but measure 30 degrees and 60 degrees are similar.

##### How do you know if two angles are congruent?

Two angles are congruent if they have the same measure. You can measure the angles with a protractor or use geometric theorems and properties to prove that they are congruent.

##### What are some important properties of congruent angles?

Some important properties of congruent angles include: vertical angles are congruent, corresponding angles are congruent, alternate interior angles are congruent, and alternate exterior angles are congruent.

##### Can two obtuse angles be congruent?

Yes, two obtuse angles can be congruent if they both have the same measure. For example, if angle A measures 120 degrees, and angle B is another angle with the same measure, then we can write: ∠A ≅ ∠B. This means that angles A and B are congruent.

##### What is the symbol used to show that two angles are congruent?

The symbol used to show that two angles are congruent is ≅. For example, if angle A and angle B are congruent, we can write: ∠A ≅ ∠B.

**Gloria Mathew** writes on math topics for K-12. A trained writer and communicator, she makes math accessible and understandable to students at all levels. Her ability to explain complex math concepts with easy to understand examples helps students master math. LinkedIn

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