In these lessons, we will learn the following:

Geometry Worksheets

Geometry Games

### How to form an Angle

## Naming An Angle

**How to name an angle?**

The vertex is the point where the two rays meet to form an angle.

Angles can be named in three ways:

1. By three capital letters, with the vertex letter in the middle. ∠ABC or ∠CBA

2. By one capital letter ∠B. This can only be used if ∠B is the only angle it could be.

3. By one lower case letter or number written in the middle of the angle.

** Have a look at the following video for another example on naming angles**

Example:

Name the vertex and and sides of ∠4, and give all possible names for ∠4.

## Measuring Angles

Worksheets for Angles in a straight line**How to use a protractor to measure an angle?**
**How to Measure a Reflex Angle Using a Protractor?**

### Angles Around A Point

**What are angles around a point?**

It will also give some examples of finding angles around a point.**Problem Solving: Angles Around a Point**

This video discusses relationships among angles around a point.

- How to form an Angle
- Naming an Angle
- Measuring Angles with a protractor
- Angles around a point (with worksheets)

Geometry Worksheets

Geometry Games

In geometry, an angle consists of two
rays
that share the same endpoint. The point
where the rays intersect is called the **vertex** of the angle.
The two rays are called the **sides** of the angle.

You can name an angle by specifying three points: two on the rays and one at the vertex.

The angle below may be specified as angle ABC or ∠ABC. The vertex point is always given in the middle.

The vertex is the point where the two rays meet to form an angle.

Angles can be named in three ways:

1. By three capital letters, with the vertex letter in the middle. ∠ABC or ∠CBA

2. By one capital letter ∠B. This can only be used if ∠B is the only angle it could be.

3. By one lower case letter or number written in the middle of the angle.

Example:

Name the vertex and and sides of ∠4, and give all possible names for ∠4.

The size of an angle is measured in degrees with the use of a protractor.

A
**straight line** has an angle of 180°

Worksheets for Angles in a straight line

The sum of angles around a point will always be **360** degrees.

In the diagram above, the sum of the angles is 70° + 55° + 50° + 65° + 120° = 360°

Example 1: Given the diagram below, determine the value of the
angle *a.*

Solution:

Step 1: Get the sum of the known angles.

30° + 65° + 150° + 73° = 318°

Step 2: Subtract sum of known angles from 360°

360° – 318° = 42°

Answer: Angle *a* is
42°

Worksheets for Angles Around a Point

It will also give some examples of finding angles around a point.

This video discusses relationships among angles around a point.

Try the free Mathway calculator and
problem solver below to practice various math topics. Try the given examples, or type in your own
problem and check your answer with the step-by-step explanations.

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